Ubuntu
linux package

  1. Lunar (23.04)
  2. Bug #1958191
  3. Comment #26

Comment 26 for bug 1958191

Revision history for this message
Anaggh S (anaggh) wrote (last edit ): Re: [i915] Screen flickering in Ubuntu 22.04 (until i915.enable_dc=0 intel_idle.max_cstate=2 are added)

Hi, following up on this - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1970426/comments/9

GRUB PARAM - `i915.enable_dc=0 intel_idle.max_cstate=2` has fixed the flicker for me.

$ uname -a
Linux home 5.15.0-30-generic #31-Ubuntu SMP Thu May 5 10:00:34 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

$ grep GRUB_CMDLINE_LINUX_DEFAULT /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2"

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Also in additional to Debian Unstable (5.17.x kernel), this flicker problem (without GRUB workaround) does not exist in recent Fedora 36 release (5.17.x kernel) as well during my testing.

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Responding to this: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1970426/comments/22

Last kernel without the bug was definitely 5.13.x on Xubuntu 21.10 (used it for about 6 months)
The bug started when I wiped and installed 22.04 release (5.15.x)

Also, I remember when 1st release - 5.15.x was released, I installed it on 21.10 release with https://github.com/bkw777/mainline and the flicker problem occurred and I reverted back to stock Ubuntu 5.13.x. So bug could be somewhere between >= 5.14.x and <= 1st release of 5.15.x.