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Groups > linux.debian.kernel > #83840

Bug#1080492: firmware-nonfree: [i915] With 20240709-2, the external monitors randomly blank for 2-3 seconds (regression)

Cross-posted to 2 groups.

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Source: firmware-nonfree
Version: 20240709-2
Severity: important

First, some context: I have a Dell laptop with 2 external monitors
connected via a dock. With 6.8+ Linux kernels, one of the external
monitors randomly blanks for 2-3 seconds (no such issue with earlier
kernels); not always the same monitor, but in most cases, not both
at the same time. I had reported the following bugs about this issue:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1072063
  https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11821

This blanking issue can occur several times per day.

After the upgrade of the binary packages of firmware-nonfree source
to 20240709-2, a new issue appeared: *both* external monitors randomly
blank for 2-3 seconds. Worse:
  * With a (non-Debian) 6.11.0-rc2+ test kernel (which I used in the
    context of the other bug), this issue occurs very often: up to
    several times per minute!
  * With the linux-image-6.7.12-amd64 Debian kernel, this issue also
    occurs (but not often), while this kernel does not have the bug
    mentioned above.

Downgrading to 20240709-1 made the issue disappear, at least with
the linux-image-6.7.12-amd64 Debian kernel (I have not tried the
6.11.0-rc2+ test kernel yet, but note that I was already using it
with 20240709-1 before September 2).

-- System Information:
Debian Release: trixie/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'proposed-updates-debug'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 6.7.12-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_WARN
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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Bug#1080492: firmware-nonfree: [i915] With 20240709-2, the external monitors randomly blank for 2-3 seconds (regression) Vincent Lefevre <vincent@vinc17.net> - 2024-09-05 02:30 +0200
  Bug#1080492: marked as done (firmware-nonfree: [i915] With  20240709-2, the external monitors randomly blank for 2-3 seconds  (regression)) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2024-09-11 22:00 +0200

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