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Old 11-03-2022, 10:58 PM   #1
leonadato
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Join Date: Nov 2022
Location: Cleveland, OH
Posts: 3
Default displays not detected in ubuntu 22.10 kernel 5.9.0-23

I've got a Dell Latitude 5521 running Ubuntu 22.10. It's connected to a Wavelink USB3 port replicator which is driving 2 external monitors via HDMI.

When I boot into the latest kernel (5.19.0-23), it cannot see the 2 external monitors.

BUT... when I boot into kernel 5.19.0-15, the 2 monitors are there no problem.

Per the instructions here (https://www.displaylink.org/forum/sh...ad.php?p=94453) I've
  • removed displaylink
  • rebooted
  • removed evdi 1.11
  • removed evdi 1.12
  • re-installed linux headers
  • re-installed displaylink
,

...and rebooted again just for good measure. No joy.

xrandr --listproviders says:

Providers: number : 1
Provider 0: id: 0x46 cap: 0x9, Source Output, Sink Offload crtcs: 4 outputs: 4 associated providers: 0 name:modesetting
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Old 11-04-2022, 05:06 PM   #2
leonadato
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Default UPDATE: less joy than before

UPDATE:
I removed everything, re-installed, and now the displays are dark in both kernels.

Yay for consistency, I guess?

Still, I really REALLY would like to get my other monitors working.
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Old 11-06-2022, 03:46 PM   #3
leonadato
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Location: Cleveland, OH
Posts: 3
Default UPDATE: fixed - disabling secure boot was the key

Welp, I went back into BIOS to double-check secure boot and sure enough it was on, and sure enough disabling it immediately allowed the external monitors to work.

So for future generations, here's a potential answer. Good luck!
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