Troubles with L14 consistently recognizing a second external (USB-C) display

[Greendrake]

As you may know, Librem 14 is capable of handling 2 external displays: one via HDMI, another via USB Type-C Video Out.

Though I have been able to use the latter, it’s been quite inconsistent: reboot, turn display off and on again, and it won’t be re-recognized by L14: the display says it sees no signal. What often helps is unplugging the USB-C cable out and plugging it back in, and even this does not give consistent luck.

Any knowledge/ideas of how to get it consistently recognize the USB-C display?

Related but not the same:

Librem 14 display over USB-C

Hello, Apologies for another post on the topic, but information is hard to distill from other posts. I have a new Librem 14 and am having issues connecting it to my monitor via USB-C. I can connect it via HDMI, which works fine, but the monitor has an integrated USB hub, sound, and ethernet that I’d like to take advantage of (only sound is recognized over HDMI). With my work laptop (a Dell XPS running Ubuntu), I can connect to a USB-C port and it recognizes all the above attached devices. W…

Troubleshoot USB-C Librem 14

It din work at first go to me also. Try multiple times by removing and inserting at the time laptop is ON and OFF and switch ON by keeping the cable plugged in. If still not working, try @Gavaudan solution switching the ends again with all variations. If not, then you can buy a new USB-C to USB-C. Also, beware in choosing the cable’s refresh rate as 60 Hz otherwise you’ll experience a lag in video. I found the cable which provided in monitor package has the 60 Hz rate capability.

[FranklyFlawless]

Try a different USB-C cable and/or use a different orientation.

[Greendrake]

It’s hard to see how that could be the cause. The cable works just fine when the monitor is recognized.

I just experienced this again: the 2nd monitor was connected but turned off, and turning it on did not make L14 recognize it. But as soon as I unplugged the USB-C cable and plugged it back, it worked.

Guess the solution would be found by digging what happens in L14 when USB-C is plugged, and making it happen as well when the monitor is turned on.