Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe-6.2 (Ubuntu)
Status: New => Confirmed
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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.
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