Librem 14 and DP-Alt via USB-C

Hardware
1

I have a Librem 14 and I’m trying to get DP working over USB-C with two Dell U2722DE monitors.

When I plug the monitor in via USB-C I see this in the kernel message (the monitor is a hub for a keyboard and mouse)

[207781.696774] usb 1-9: new high-speed USB device number 91 using xhci_hcd
[207781.846222] usb 1-9: New USB device found, idVendor=0424, idProduct=4206, bcdDevice= 6.12
[207781.846242] usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[207781.846250] usb 1-9: Product: USB4206 Smart Hub
[207781.846255] usb 1-9: Manufacturer: Microchip
[207781.848511] hub 1-9:1.0: USB hub found
[207781.848554] hub 1-9:1.0: 5 ports detected
[207782.137733] usb 1-9.2: new low-speed USB device number 92 using xhci_hcd
[207782.233327] usb 1-9.2: New USB device found, idVendor=1a7c, idProduct=0191, bcdDevice= 2.70
[207782.233344] usb 1-9.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[207782.233351] usb 1-9.2: Product: Evoluent VerticalMouse 4
[207782.233356] usb 1-9.2: Manufacturer: SONiX
[207782.240799] input: SONiX Evoluent VerticalMouse 4 as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9.2/1-9.2:1.0/0003:1A7C:0191.0028/input/input68
[207782.241482] hid-generic 0003:1A7C:0191.0028: input,hidraw1: USB HID v1.00 Mouse [SONiX Evoluent VerticalMouse 4] on usb-0000:00:14.0-9.2/input0
[207782.426723] usb 1-9.3: new low-speed USB device number 93 using xhci_hcd
[207782.555321] usb 1-9.3: New USB device found, idVendor=058f, idProduct=9410, bcdDevice= 1.22
[207782.555338] usb 1-9.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[207782.555345] usb 1-9.3: Product: KB800 Kinesis Freestyle
[207782.555350] usb 1-9.3: Manufacturer: KINESIS FREESTYLE KB800
[207782.576537] input: KINESIS FREESTYLE KB800 KB800 Kinesis Freestyle as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9.3/1-9.3:1.0/0003:058F:9410.0029/input/input69
[207782.628256] maltron 0003:058F:9410.0029: input,hidraw2: USB HID v1.10 Keyboard [KINESIS FREESTYLE KB800 KB800 Kinesis Freestyle] on usb-0000:00:14.0-9.3/input0
[207782.638317] input: KINESIS FREESTYLE KB800 KB800 Kinesis Freestyle as /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9.3/1-9.3:1.1/0003:058F:9410.002A/input/input70
[207782.690372] maltron 0003:058F:9410.002A: input,hidraw3: USB HID v1.10 Device [KINESIS FREESTYLE KB800 KB800 Kinesis Freestyle] on usb-0000:00:14.0-9.3/input1
[207782.874724] usb 1-9.4: new high-speed USB device number 94 using xhci_hcd
[207782.968633] usb 1-9.4: New USB device found, idVendor=0424, idProduct=4216, bcdDevice= 1.88
[207782.968638] usb 1-9.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[207782.968641] usb 1-9.4: Product: USB4216 Smart Hub
[207782.968642] usb 1-9.4: Manufacturer: Microchip
[207782.969538] hub 1-9.4:1.0: USB hub found
[207782.969560] hub 1-9.4:1.0: 4 ports detected
[207783.046786] usb 1-9.5: new high-speed USB device number 95 using xhci_hcd
[207783.176142] usb 1-9.5: New USB device found, idVendor=0424, idProduct=7260, bcdDevice= 1.35
[207783.176157] usb 1-9.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[207783.176162] usb 1-9.5: Product: USB2 Controller Hub
[207783.176167] usb 1-9.5: Manufacturer: Microchip Tech
[207783.186535] hid-generic 0003:0424:7260.002B: hiddev96,hidraw4: USB HID v1.10 Device [Microchip Tech USB2 Controller Hub] on usb-0000:00:14.0-9.5/input1
[207783.715844] usb 1-9.4.2: new high-speed USB device number 96 using xhci_hcd
[207783.805450] usb 1-9.4.2: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=31.00
[207783.805466] usb 1-9.4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[207783.805473] usb 1-9.4.2: Product: USB 10/100/1000 LAN
[207783.805478] usb 1-9.4.2: Manufacturer: Realtek
[207783.805482] usb 1-9.4.2: SerialNumber: 001000001
[207783.884740] usb 1-9.4.4: new high-speed USB device number 97 using xhci_hcd
[207783.983293] usb 1-9.4.4: New USB device found, idVendor=0424, idProduct=7240, bcdDevice= 2.07
[207783.983310] usb 1-9.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[207783.983317] usb 1-9.4.4: Product: USB2 Controller Hub
[207783.983322] usb 1-9.4.4: Manufacturer: Microchip Tech
[207784.053121] usb 1-9.4.2: reset high-speed USB device number 96 using xhci_hcd
[207784.165918] r8152 1-9.4.2:1.0: load rtl8153b-2 v1 10/23/19 successfully
[207784.194797] r8152 1-9.4.2:1.0 eth0: v1.11.11
[207784.264013] r8152 1-9.4.2:1.0 enp0s20f0u9u4u2: renamed from eth0

But I never see any indication of the screen being detected.

I’m using Fedora SilverBlue with Gnome 40, Wayland and the 5.12 kernel. From what I can tell the Librem 14 with PureOS should have shipped with mainline Linux (I don’t see a fork in the Purism sources) so this should be pretty much the same setup as PureOS. Any idea why Linux doesn’t see the display, do I need any kernel patches?

2

For fault isolation purposes, can you try PureOS?

You probably want lsusb output in addition to kernel / log messages.

3

Unfortunately I can’t really. I don’t want to reinstall the OS.

The lsusb that appears when plugging in the monitor is.

You can see the network provided by the Ethernet in the monitor and I have removed the keyboard and mouse that appear

Bus 001 Device 015: ID 0424:7260 Microchip Technology, Inc. (formerly SMSC) USB2 Controller Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.01
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0424 Microchip Technology, Inc. (formerly SMSC)
  idProduct          0x7260 
  bcdDevice            1.35
  iManufacturer           1 Microchip Tech
  iProduct                2 USB2 Controller Hub
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0032
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              3 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      29
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1

Bus 001 Device 020: ID 0424:7240 Microchip Technology, Inc. (formerly SMSC) USB2 Controller Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.01
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0424 Microchip Technology, Inc. (formerly SMSC)
  idProduct          0x7240 
  bcdDevice            2.07
  iManufacturer           1 Microchip Tech
  iProduct                2 USB2 Controller Hub
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0012
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 

Bus 001 Device 018: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0bda Realtek Semiconductor Corp.
  idProduct          0x8153 RTL8153 Gigabit Ethernet Adapter
  bcdDevice           31.00
  iManufacturer           1 Realtek
  iProduct                2 USB 10/100/1000 LAN
  iSerial                 6 001000001
  bNumConfigurations      2
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0027
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              350mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol      0 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               8
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0050
    bNumInterfaces          2
    bConfigurationValue     2
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              350mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      6 Ethernet Networking
      bInterfaceProtocol      0 
      iInterface              5 
      CDC Header:
        bcdCDC               1.10
      CDC Union:
        bMasterInterface        0
        bSlaveInterface         1 
      CDC Ethernet:
        iMacAddress                      3 (??)
        bmEthernetStatistics    0x00000000
        wMaxSegmentSize               1514
        wNumberMCFilters            0x0000
        bNumberPowerFilters              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval               8
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0

Bus 001 Device 017: ID 0424:4216 Microchip Technology, Inc. (formerly SMSC) USB4216 Smart Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         2 TT per port
  bMaxPacketSize0        64
  idVendor           0x0424 Microchip Technology, Inc. (formerly SMSC)
  idProduct          0x4216 
  bcdDevice            1.88
  iManufacturer           1 Microchip
  iProduct                2 USB4216 Smart Hub
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0029
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      1 Single TT
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      2 TT per port
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12

Bus 001 Device 013: ID 0424:4206 Microchip Technology, Inc. (formerly SMSC) USB4206 Smart Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         2 TT per port
  bMaxPacketSize0        64
  idVendor           0x0424 Microchip Technology, Inc. (formerly SMSC)
  idProduct          0x4206 
  bcdDevice            6.12
  iManufacturer           1 Microchip
  iProduct                2 USB4206 Smart Hub
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0029
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      1 Single TT
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      2 TT per port
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
4

booting a live USB is a much easier way to test

4 Likes
5

That’s what I meant - or, worst case, install PureOS on an external disk and boot that. There should be no need to touch the existing OS.

6

Thanks! I only managed to find a download for PureOS 9, not PureOS 10. I tried that and no luck. It did detect the USB hub and Ethernet, the same as Fedora, but no monitor.

7

I think this is the download for PureOS 10 that you couldn’t find. https://downloads.puri.sm/byzantium/gnome/2021-04-18/

8

Any more insight into this issue? I’ve running into the same thing with my monitor.

9

distro? kernel?

I can reproduce with Fedora SilverBlue, but PureOS 10 works fine here

10

Sorry for the delay here. It’s running PureOS 10. I’ve had some success with a usb-c to dp cord but not on my usb-c to usb-c. Unfortunately, the port itself has started to have some significant wiggle and the have been some visual artifacts and bad behavior with the working cord.

Since my unit was obviously treated pretty roughly in the warehouse (already getting screws and bottom plate replaced) I’m somewhat worried about board issues.

Not much of a hardware person but I figure I’ll open it up tomorrow and take a look.

1 Like
11

you realize they have to open it up to install the RAM and SSD per your config, right? I’m not sure why you feel there is evidence of it being treated roughly though

12

Totally aware and not trying to light a fire about it. Since I’ve already talked to support and they’re replacing the stripped screws and scratched bottom plate, that part isn’t a big deal. With that said, it strikes me as already existing evidence in the direction of a quality problem concerning my unit specifically. That in turn, is why I’m worried.

13

Would a verbose lsusb help someone give me a hand chasing this down? My mouse is plugged in through the monitor.

Bus 002 Device 002: ID 05e3:0749 Genesys Logic, Inc. SD Card Reader and Writer
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         9
  idVendor           0x05e3 Genesys Logic, Inc.
  idProduct          0x0749 SD Card Reader and Writer
  bcdDevice           15.32
  iManufacturer           3 Generic
  iProduct                4 USB3.0 Card Reader
  iSerial                 2 000000001532
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x002c
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              896mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               4
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x0016
  bNumDeviceCaps          2
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000f0e
      BESL Link Power Management (LPM) Supported
    BESL value     3840 us 
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat          10 micro seconds
    bU2DevExitLat        2047 micro seconds
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x000c
  (Bus Powered)
  U1 Enabled
  U2 Enabled

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         3 
  bMaxPacketSize0         9
  idVendor           0x1d6b Linux Foundation
  idProduct          0x0003 3.0 root hub
  bcdDevice            5.10
  iManufacturer           3 Linux 5.10.0-7-amd64 xhci-hcd
  iProduct                2 xHCI Host Controller
  iSerial                 1 0000:00:14.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x001f
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
        bMaxBurst               0
can't get hub descriptor, LIBUSB_ERROR_TIMEOUT (Resource temporarily unavailable)
can't get debug descriptor: Resource temporarily unavailable
cannot read device status, Resource temporarily unavailable (11)

Bus 001 Device 107: ID 2109:8886 VIA Labs, Inc. USB Billboard Device   
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.01
  bDeviceClass          254 Application Specific Interface
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x2109 VIA Labs, Inc.
  idProduct          0x8886 
  bcdDevice            0.01
  iManufacturer           1 VIA Labs, Inc.         
  iProduct                2 USB Billboard Device   
  iSerial                 3 0000000000000001
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0012
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          3 0000000000000001
    bmAttributes         0xc0
      Self Powered
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass        17 
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              3 0000000000000001
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x0051
  bNumDeviceCaps          3
  Billboard Capability:
    bLength                    48
    bDescriptorType            16
    bDevCapabilityType         13
    iAddtionalInfoURL           3 0000000000000001
    bNumberOfAlternateModes     1
    bPreferredAlternateMode     0
    VCONN Power                 0 1W
    bmConfigured                03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    bcdVersion               1.21
    bAdditionalFailureInfo      0
    bReserved                   0
    Alternate Modes supported by Device Container:
    Alternate Mode 0 : Alternate Mode configuration successful
      wSVID[0]                    0xFF01
      bAlternateMode[0]           0
      iAlternateModeString[0]     3 0000000000000001
  Billboard Alternate Mode Capability:
    bLength                     8
    bDescriptorType            16
    bDevCapabilityType         15
    bIndex                      0
    dwAlternateModeVdo          0x05000000
  Container ID Device Capability:
    bLength                20
    bDescriptorType        16
    bDevCapabilityType      4
    bReserved               0
    ContainerID             {30eef35c-07d5-2549-b001-802d79434c30}
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered

Bus 001 Device 109: ID 1b20:0400 MStar Semiconductor, Inc. BillBoard
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.01
  bDeviceClass           17 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x1b20 MStar Semiconductor, Inc.
  idProduct          0x0400 
  bcdDevice            1.00
  iManufacturer           1 MSTAR
  iProduct                2 BillBoard
  iSerial                 3 12345
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0012
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          2 BillBoard
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass        17 
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              2 BillBoard
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x0051
  bNumDeviceCaps          3
  Container ID Device Capability:
    bLength                20
    bDescriptorType        16
    bDevCapabilityType      4
    bReserved               0
    ContainerID             {202d6b4d-1fbe-e311-b1b6-0800200c9a66}
  Billboard Capability:
    bLength                    48
    bDescriptorType            16
    bDevCapabilityType         13
    iAddtionalInfoURL           4 12345
    bNumberOfAlternateModes     1
    bPreferredAlternateMode     0
    VCONN Power             32768 VCONN power not required
    bmConfigured                01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    bcdVersion               1.21
    bAdditionalFailureInfo      0
    bReserved                   0
    Alternate Modes supported by Device Container:
    Alternate Mode 0 : Alternate Mode configuration not attempted
      wSVID[0]                    0xFF01
      bAlternateMode[0]           0
      iAlternateModeString[0]     4 12345
  Billboard Alternate Mode Capability:
    bLength                     8
    bDescriptorType            16
    bDevCapabilityType         15
    bIndex                      0
    dwAlternateModeVdo          0xC5000C01
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered

Bus 001 Device 111: ID 046d:c52b Logitech, Inc. Unifying Receiver
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        32
  idVendor           0x046d Logitech, Inc.
  idProduct          0xc52b Unifying Receiver
  bcdDevice           24.11
  iManufacturer           1 Logitech
  iProduct                2 USB Receiver
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0054
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          4 RQR24.11_B0036
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower               98mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      59
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               8
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      2 Mouse
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     148
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               2
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      98
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0020  1x 32 bytes
        bInterval               2
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)

Bus 001 Device 106: ID 2109:2211 VIA Labs, Inc. USB2.0 Hub             
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         2 TT per port
  bMaxPacketSize0        64
  idVendor           0x2109 VIA Labs, Inc.
  idProduct          0x2211 
  bcdDevice            4.24
  iManufacturer           1 VIA Labs, Inc.         
  iProduct                2 USB2.0 Hub             
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0029
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      1 Single TT
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      2 TT per port
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             4
  wHubCharacteristic 0x00e9
    Per-port power switching
    Per-port overcurrent protection
    TT think time 32 FS bits
    Port indicators
  bPwrOn2PwrGood      175 * 2 milli seconds
  bHubContrCurrent    100 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0103 power enable connect
   Port 2: 0000.0103 power enable connect
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x002a
  bNumDeviceCaps          3
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000006
      BESL Link Power Management (LPM) Supported
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat           4 micro seconds
    bU2DevExitLat         231 micro seconds
  Container ID Device Capability:
    bLength                20
    bDescriptorType        16
    bDevCapabilityType      4
    bReserved               0
    ContainerID             {30eef35c-07d5-2549-b001-802d79434c30}
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered

Bus 001 Device 105: ID 2109:2820 VIA Labs, Inc. VL820 Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         2 TT per port
  bMaxPacketSize0        64
  idVendor           0x2109 VIA Labs, Inc.
  idProduct          0x2820 VL820 Hub
  bcdDevice            d.04
  iManufacturer           1 VIA Labs, Inc.         
  iProduct                2 USB2.0 Hub             
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0029
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      1 Single TT
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      2 TT per port
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval              12
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             5
  wHubCharacteristic 0x00e9
    Per-port power switching
    Per-port overcurrent protection
    TT think time 32 FS bits
    Port indicators
  bPwrOn2PwrGood      175 * 2 milli seconds
  bHubContrCurrent    100 milli Ampere
  DeviceRemovable    0x20
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0100 power
   Port 4: 0000.0503 highspeed power enable connect
   Port 5: 0000.0503 highspeed power enable connect
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength       0x0049
  bNumDeviceCaps          5
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000006
      BESL Link Power Management (LPM) Supported
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat           4 micro seconds
    bU2DevExitLat         231 micro seconds
  Container ID Device Capability:
    bLength                20
    bDescriptorType        16
    bDevCapabilityType      4
    bReserved               0
    ContainerID             {30eef35c-07d5-2549-b001-802d79434c30}
  SuperSpeedPlus USB Device Capability:
    bLength                28
    bDescriptorType        16
    bDevCapabilityType     10
    bmAttributes         0x00000023
      Sublink Speed Attribute count 3
      Sublink Speed ID count 1
    wFunctionalitySupport   0x1100
    bmSublinkSpeedAttr[0]   0x00050030
      Speed Attribute ID: 0 5Gb/s Symmetric RX SuperSpeed
    bmSublinkSpeedAttr[1]   0x000500b0
      Speed Attribute ID: 0 5Gb/s Symmetric TX SuperSpeed
    bmSublinkSpeedAttr[2]   0x000a4031
      Speed Attribute ID: 1 10Gb/s Symmetric RX SuperSpeedPlus
    bmSublinkSpeedAttr[3]   0x000a40b1
      Speed Attribute ID: 1 10Gb/s Symmetric TX SuperSpeedPlus
  ** UNRECOGNIZED:  03 10 0b
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x1d6b Linux Foundation
  idProduct          0x0002 2.0 root hub
  bcdDevice            5.10
  iManufacturer           3 Linux 5.10.0-7-amd64 xhci-hcd
  iProduct                2 xHCI Host Controller
  iSerial                 1 0000:00:14.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0019
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
Hub Descriptor:
  bLength              11
  bDescriptorType      41
  nNbrPorts            12
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
    TT think time 8 FS bits
  bPwrOn2PwrGood       10 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x0c 0x00
  PortPwrCtrlMask    0xff 0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
   Port 5: 0000.0100 power
   Port 6: 0000.0100 power
   Port 7: 0000.0100 power
   Port 8: 0000.0503 highspeed power enable connect
   Port 9: 0000.0100 power
   Port 10: 0000.0100 power
   Port 11: 0000.0100 power
   Port 12: 0000.0100 power
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
  Self Powered
14

Sorry about the long delay here.

I just tested PureOS 10 and it also doesn’t work. Using PureOS 10 on a USB live boot with the 5.10.0-5 kernel I see the USB hub but no display output. It’s the exact same response that I see on Fedora SilverBlue. The monitor doesn’t see any USB-C connection.

I tested the monitor with a PinePhone and the monitor does work with DP over USB-C.