External 5K Monitor for the Libreum 15 rev3

Hardware
1

I’m looking to get some more resolution for the Libreum 15 rev3 . I’m trying to go with 5k … In the LG UltraFine monitor I can use the thunderbold 3 port utilizing 8 video channels …

1 Thunderbold 3 Input 882 mega pixels per second

Todd says as of rev2 “[USB-C] supports video output on par with the first-gen Thunderbolt channel” … A few search titles imply this is a version of thunderbolt 3. :wink:

https://puri.sm/posts/purism-librem-15-rev2-usb-3-1-type-c/

LG 27MD5KB-B UltraFine 27" 16:9 5K (5120 x 2880) IPS Monitor, 500 cd/m² Brightness, Thunderbolt 3/USB Type-C Inputs

The monitor does have a mic and camera that could by-pass the hardware cut switch. I’ll have to live with that, probably OK though given coreboot should make unauthorized access more difficult.

There are various thunderbolt 3 adapters that accept an HDMI + USB-C (or just USB) and provide a thunderbolt connection. I’m not finding any other 5k displays that are known to work on Linux so I guess it is back to the question: is the Librem’s first-gen Thunderbolt support going to work at 5k with this monitor?

2

No, this is old post. Current models, Librem 15v3 and Librem 13v3, do not have USB 3.1, only USB 3.0. So no video support, I’m afraid.

3

The current spec page has this:

External monitor output 1 micro HDMI Port 1 HDMI Port (4K capable) 1 HDMI Port (4K capable)

Does this go up to 4096 × 2160? It looks like there are 2 versions of 4k:

(UHD 4K) 3840 × 2160 pixels 16:9 Approx. 185 ppi Approx. 0.14 mm
(DCI 4K) 4096 × 2160 pixels Approx. 17:9 Approx. 149 ppi Approx. 0.17 mm

Guess I’ll give up on the adapter, looks like there is not much support hre for that. I do appreciate clarification though so I can make the best purchase.

4

You can get 4K UHD output but only at 30Hz. Please have a look here: https://tracker.pureos.net/T298#8485