Public bug reported:
Updating to 6.5.0-1024.25_oem from 6.5.0-1023.24_oem breaks HDMI video
on the Lenovo Thunderbolt 3 Gen 2 USB-C dock. I am using a Thinkpad P16s
with a Ryzen 7 PRO 7840U CPU and Ubuntu 22.04.4 LTS.
When using this new kernel version, all monitors plugged in via the dock
display nothing during boot and after logging in to Ubutnu. The monitors
are also not detected in the Settings->Displays section. I am using 2
HDMI Dell monitors in addition to the built-in display on the Laptop.
The monitors show that they do not detect any input (as opposed to
receiving a blank/black input).
Manually booting to the old 6.5.0-1023.24_oem kernel in GRUB fixes the
issue.
It looks like there was a fix for HDMI/DP audio using USB-C docks in the
new 6.5.0-1024.25_oem kernel; Maybe the issue is there.
This was the changelog entry:
* Fix inaudible HDMI/DP audio on USB-C MST dock (LP: #2064689)
- SAUCE: drm/i915/audio: Fix audio time stamp programming for DP
And here is a link to that issue: https://launchpad.net/bugs/2064689
If there are any logs or additional details I can provide, I am happy to
help.
** Affects: linux-oem-6.5 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2069357
Title:
Multimonitor support broken on kernel 6.5.0-1024.25_oem on Lenovo
Thunderbolt 3 Gen 2 USB-C dock
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