I don't hit the problem when I use Nvidia drivers instead of xserver- xorg-video-nouveau on my Thinkpad.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-hwe-6.2 in Ubuntu. https://bugs.launchpad.net/bugs/2029362 Title: Two external monitors garbled on newer kernels than 5.19 Status in linux-signed-hwe-6.2 package in Ubuntu: Confirmed Bug description: Hardware: Lenovo ThinkPad model 20ST0055AU Description: Ubuntu 22.04.2 LTS Release: 22.04 Kernel: 6.2.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jul 13 16:27:29 UTC 2 x86_64 x86_64 x86_64 GNU/Linux What I expected to happen: Using Lenovo dock via Thunderbolt connector, and with two DisplayPort monitors connected for three monitors in total. Display should be usable, and in fact _does_ work with 5.19. What happened instead: When attempting to use any ubuntu kernel > 5.19 I have had garbled output on the DisplayPort monitors. I've checked on a few 6.2.0 kernels as have come through as part of linux-image-generic-hwe-22.04-edge, plus it also occurs on linux- image-6.1.0-1017-oem . I've attached a picture taken with my phone on bootup while prompted for the disk encryption password. The GUI also displays in a similar garbled fashion if I let it boot further and is unusable. This happens on a Lenovo thunderbolt dock (which was actively attached when producing the lspci and lsusb output attached here), but I've also confirmed this issue occurs on a Dell WD19TB thunderbolt dock with 1xHDMI connection as well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.2/+bug/2029362/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
