Ubuntu
linux-hwe-5.19 package

  1. Bug #2007718
  2. Comment #17

Comment 17 for bug 2007718

Revision history for this message
Roemer Claasen (rclaasen) wrote (last edit ):

Hi Daniel, thanks for the suggestion!

My current setup:

$ uname -rv
6.1.0-1007-oem #7-Ubuntu SMP PREEMPT_DYNAMIC Wed Feb 8 15:41:05 UTC 2023

$ cat /sys/kernel/debug/dri/0/eDP-1/psr_capability
Sink support: yes [0x03]
Driver support: yes [0x01]

$ cat /sys/kernel/debug/dri/0/eDP-1/psr_state
6

I was sort of expecting psr_state to be either 0 or 1?! can't immediately find documentation and have no time right now, but will do some experiments later and let you know the results.

BTW this seems unrelated to the suspend/resume, and since 6.1 is still not officially released by Ubuntu, I'm not filing another bug report. Should I?!

UPDATE:

Disabling PSR (Panel Self Refresh) indeed fixes the screen flickering. 6.1 from linux-oem-22.04c is now running without issues.
Disabling can be done by adding a kernel boot parameter:

 - open `/etc/ default/grub`
 - add "amdgpu.dcdebugmask=0x10" as kernel boot parameter to `GRUB_CMDLINE_LINUX_DEFAULT` (on my system this now reads "quiet splash amdgpu.dcdebugmask=0x10")
 - call `sudo update-grub`
 - reboot