Bug#1043564: linux: Please Re-enable DC states for drm/i915

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1043564: linux: Please Re-enable DC states for drm/i915
Date	2023-08-13 07:50 +0200
Message-ID	<H2c9c-1tbv-5@gated-at.bofh.it> (permalink)
References	<H29l0-1rcK-3@gated-at.bofh.it> <H29l0-1rcK-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Control: tags -1 + confirmed upstream fixed-upstream pending

Hi,

On Sat, Aug 12, 2023 at 10:40:09PM -0400, Jesse Rhodes wrote:
> Source: linux
> Severity: important
> Tags: patch
> X-Debbugs-Cc: jesse@sney.ca
> 
> Dear debian kernel team,
> 
> The upstream commit "drm/i915: Disable DC states for all commits" [1] breaks my
> Asus C204M Chromebook's ability to wake the screen after power management shuts
> it off. This also produces a kernel stack trace, attached. It's likely that it
> has the same effect on other Intel Gemini Lake hardware or UHD 600 video
> devices.
> 
> I discovered this commit by bisecting between 6.1.0-7 (6.1.20-2) and
> 6.1.0-8 (6.1.25-1), and confirmed that the current 6.1.0-10 (6.1.38-2) does not
> have the issue if intel_display.c is rolled back to its previous state.
> 
> Attached is also the lspci output for the affected machine.
> 
> I hope that "Tags: patch" is allowed as a tag when the fix is to revert a
> specific commit, and I apologize if this was already reported and I couldn't
> find it in the list.
> 
> Please let me know if you need any more information, as I would be happy to
> keep debugging!

Thanks for the report. The commit was found indeed to cause issues and
was for now reverted upstream in the 6.1.y series and released in
6.1.45.

The fix will be contained in the next bookworm point release update,
have just added the bugcloser for this issue as well in the current
rebase work:

https://salsa.debian.org/kernel-team/linux/-/merge_requests/803/diffs?commit_id=050b84b3c21f5a5b5e15b562da2ffc9f0edfda3a

Regards,
Salvatore

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Bug#1043564: linux: Please Re-enable DC states for drm/i915 Salvatore Bonaccorso <carnil@debian.org> - 2023-08-13 07:50 +0200
  Processed: Re: Bug#1043564: linux: Please Re-enable DC states for  drm/i915 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2023-08-13 07:50 +0200
  Bug#1043564: linux: Please Re-enable DC states for drm/i915 Jesse Rhodes <jesse@sney.ca> - 2023-08-13 18:00 +0200

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