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Bug#1148534: src:linux: amdgpu flip_done timed out wedges display on 7.1.8-1~bpo13+1, not on 7.1.3-1~bpo13+1 (Navi 14 + Renoir)

Cross-posted to 2 groups.

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On Sun, Sep 20, 2026 at 05:20:42PM +0200, ludopika@gmail.com wrote:
> Package: src:linux
>   Version: 7.1.8-1~bpo13+1
>   Severity: important
>   Tags: upstream
>   X-Debbugs-Cc: ludopika@gmail.com
> 
>   Dear Maintainer,
> 
>   Since upgrading the backports kernel from 7.1.3 to 7.1.8, the display
>   pipeline wedges at random after a few hours of uptime: the screen
> stops
>   updating while the rest of the system keeps running normally (the
> journal
>   keeps growing for hours behind the frozen image, SSH and cron still
> work).
>   Only a reboot restores the affected CRTC reliably.
> 
>   The kernel logs "[drm] *ERROR* flip_done timed out", followed by
>   "commit wait timed out" on the CRTC, the plane and the connector, and
> by a
>   WARNING in dm_arm_vblank_event().
> 
>   Both amdgpu devices of this hybrid laptop are affected,
> independently: the
>   Navi 14 dGPU (0000:03:00.0, HDMI-A-1) and the Renoir iGPU
> (0000:07:00.0,
>   eDP-1).
> 
>   I have kept 7.1.3+deb13-amd64 installed and I can boot either kernel
> on
>   demand, so the regression window is narrow and testable. I am willing
> to
>   bisect or to test intermediate kernels if that helps.

Bisecting would probably be useful. Might be useful to test a newer
upstream kernel first. There is 7.2.6 in the Debian archive.

Please tell if you need instructions for a bisection.
(https://bugs.debian.org/1147177 contains such an instruction that
should be easily adaptable for your situation.)

> [... much data generated probably by an AI agent ...]

While an AI agent is helpful at times to report a bug, please still
provide the traditional info generated by reportbug. This is much more
useful for us.

Best regards
Uwe

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Bug#1148534: src:linux: amdgpu flip_done timed out wedges display on 7.1.8-1~bpo13+1, not on 7.1.3-1~bpo13+1 (Navi 14 + Renoir) ludopika@gmail.com - 2026-09-20 17:30 +0200
  Bug#1148534: src:linux: amdgpu flip_done timed out wedges display on 7.1.8-1~bpo13+1, not on 7.1.3-1~bpo13+1 (Navi 14 + Renoir) Uwe Kleine-König <ukleinek@debian.org> - 2026-09-23 16:40 +0200

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