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displays not detected in ubuntu 22.10 kernel 5.9.0-23

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Number9

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Registration: 03.04.2002

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 () I'veremoved 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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99 NSX-Z SC (360 RWHP) 95 Dinan S3 M3 (355 RWHP)
Message # 1 22.12.24 - 02:43:10
RE: displays not detected in ubuntu 22.10 kernel 5.9.0-23

marc1119

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Registration: 11.08.2003

UPDATE: less joy than before 

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Message # 2 22.12.24 - 02:48:23
RE: displays not detected in ubuntu 22.10 kernel 5.9.0-23

beowoulf

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Messages: 415
Registration: 08.03.2003

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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Alex
Message # 3 22.12.24 - 02:53:14
RE: displays not detected in ubuntu 22.10 kernel 5.9.0-23

AndrewM3

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Messages: 684
Registration: 09.05.2003

UPDATE: fixed - disabling secure boot was the key 

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Message # 4 22.12.24 - 02:58:55
RE: displays not detected in ubuntu 22.10 kernel 5.9.0-23

v.b.

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Messages: 3,747
Registration: 01.28.2002

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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(Weekend ride)
Message # 5 22.12.24 - 03:04:31
RE: displays not detected in ubuntu 22.10 kernel 5.9.0-23
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