[Intel-gfx] REGRESSION with 5.12: Suspend not working on Toshiba notebook

[Andreas Friedrich]

On Fri, Apr 30, 2021 at 11:31:47AM +0300, Joonas Lahtinen wrote:

Hello Joonas,

thank you for your quick response.
...
> That is a merge commit, it doesn't itself change anything as there were no
> conflicts. It just indicates that two trees got merged.
...
> If you are able to provide a bisect to a one patch, please do report it
> as a bug, let's then take it from there.

I have bisect the kernel 3 times and it always leads me to the wrong
end. Because not every suspend results in a frozen system, maybe I
have marked a 'bisect good' although it was bad.

What I surely can say is, that kernel 5.11.16 works fine and 5.12-rc1
(v5.12-rc1-dontuse) does not.

However, on the bisecting path I saw the following commits:
  [41a9c75d0acf23f33f012d3f9535de9e9b631051] drm/i915/gem: Move stolen node into GEM object union
  [d82afcf9caaac26ce2642511115bca9dacf30f41] Merge tag 'drm-intel-gt-next-2021-01-21-1' of git://anongit.freedesktop.org/drm/drm-intel into drm-next
  [885e1938452fc7fc37a3051d76e1ddb7ead099fa] drm/i915/gvt: statically set F_CMD_WRITE_PATCH flag
  [a2dd2ff50cde3cbbeecec72225bb18582b291f14] drm/i915/gt: Skip over completed active execlists, again
  [02dd2b12a685944c4d52c569d05f636372a7b6c7] drm/i915/gvt: unify lri cmd handler and mmio handlers
  [69b4b99842201bc24c98ba66b922d8879e190483] drm/i915/gvt: Add missing forward decl of intel_vgpu for HDRTEST
  [c071a6c0fef0fade787d827c7fc0e07481512326] Merge tag 'gvt-gt-next-2021-01-18' of https://github.com/intel/gvt-linux into drm-intel-gt-next

So I think it's a drm-i915 issue. I have communicated with David
Airlie (airlied at redhat.com) and he also bets on an i915 bug.
...
> https://01.org/linuxgraphics/documentation/how-report-bugs

Following https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs
I can give you the following infos:
  - After calling 'echo mem > /sys/power/state' the system gets frozen
    (the screen is dimmed but the CPU fan is still running). The
    system is inaccessible from remote. The only way to get it working
    again is to hard power off and on.
  - One out of 5 suspend tries will cause the issue, mostly the first one.
  - Notebook: Old Toshiba Tecra A10 from 2009.
  - x86_64, 5.12-rc1, Debian GNU/Linux 10 (buster), see dmidecode.txt.gz
    and 5.12.config.gz
  - Because the system is frozen, I cannot read /sys/class/drm/card0/error
    before rebooting.

Please let me know if I can do anyting else to solve the problem.

Best regards
Andreas Friedrich
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