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Groups > linux.debian.bugs.dist > #1298425

Bug#1139942: linux-image-amd64: Desktop reboots upon resume from suspend

Cross-posted to 2 groups.

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Package: linux-image-amd64
Version: 6.12.90-2
Severity: normal
X-Debbugs-Cc: debian-amd64@lists.debian.org
User: debian-amd64@lists.debian.org
Usertags: amd64

Dear Maintainer,

After a power failure a week ago, my desktop started to be unable to
resume from suspend.  More specifically, it would reboot during the
resume.  Not all the time, but about 50% of the time.

At first I thought it was a hardware problem linked to the power
failure, but after some experimentation (which showed that hibernation
worked reliably), I tried to reboot into the previous 6.12.88 kernel,
and sure enough this one suspends&resumes just as reliably as before.

The behavior I can see is quite limited: everything seems to work as
usual during suspend, which ends with the machine's light blinking and
the monitor going to sleep.  When I hit a key on the keyboard, the
machine's light stops blinking (and stays on), then the monitor's light
stops blinking (but it remains dark at this stage, which is quite normal
because it takes a while for it to start displaying a picture), and
after a few more seconds sometimes the system wakes up normally, but
other times (about 50% of the time) the keyboard's "num lock" led turns
on (which I interpret to mean that the machine has started rebooting)
and after a few more seconds the screen shows the BIOS's
booting sequence.

This machine has been running Debian stable and doing suspend/resume
sequences for the last 10 years without much trouble (beside
occasionally needing me to disconnect and reconnect the USB hub on which
the keyboard is connected), so I'm hopeful that it's a minor
regression that will be addressed easily.


=== Stefan


-- System Information:
Debian Release: 13.5
  APT prefers stable-security
  APT policy: (990, 'stable-security'), (990, 'stable'), (500, 'testing'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.88+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=fr_CH.UTF-8, LC_CTYPE=fr_CH.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

Versions of packages linux-image-amd64 depends on:
pn  linux-image-6.12.90+deb13.1-amd64  <none>

linux-image-amd64 recommends no packages.

linux-image-amd64 suggests no packages.

-- no debconf information

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Bug#1139942: linux-image-amd64: Desktop reboots upon resume from suspend Stefan Monnier <monnier@iro.umontreal.ca> - 2026-06-13 21:20 +0200
  Bug#1139942: linux-image-amd64: Desktop reboots upon resume from suspend Salvatore Bonaccorso <carnil@debian.org> - 2026-06-17 16:00 +0200
    Bug#1139942: linux-image-amd64: Desktop reboots upon resume from suspend Stefan Monnier <monnier@iro.umontreal.ca> - 2026-06-17 17:20 +0200

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