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Bug#1142863: linux-image-6.12.96+deb13-amd64: S3 (deep) suspend powers the machine off instead of suspending

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  Bug#1142863: linux-image-6.12.96+deb13-amd64: S3 (deep) suspend powers the machine off instead of suspending Salvatore Bonaccorso <carnil@debian.org> - 2026-07-29 17:30 +0200
    Processed: Re: Bug#1142863: linux-image-6.12.96+deb13-amd64: S3  (deep) suspend powers the machine off instead of suspending "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-07-29 17:30 +0200

#93513 — Bug#1142863: linux-image-6.12.96+deb13-amd64: S3 (deep) suspend powers the machine off instead of suspending

Control: tags -1 + moreinfo

Hi

On Sun, Jul 26, 2026 at 08:27:24PM -0600, chrisbrasington wrote:
> Package: src:linux
> Version: 6.12.96-1
> Severity: important
> X-Debbugs-Cc: debian-amd64@lists.debian.org, gpomaayll@mozmail.com
> User: debian-amd64@lists.debian.org
> Usertags: amd64
> 
> Subject: linux-image-6.12.96+deb13-amd64: S3 (deep) suspend powers the machine off instead of suspending; 6.12.95 unaffected
> 
> Package: linux-image-6.12.96+deb13-amd64
> Version: 6.12.96-1
> Severity: important
> 
> Since upgrading to 6.12.96-1 from trixie-security, closing the lid powers
> the machine off completely instead of suspending. Not a failed resume, not a
> hang: the machine is fully off, and pressing power gives a cold boot with a
> dirty filesystem and journal replay. Unsaved work is lost.
> 
> 6.12.95-1 on identical hardware and config does not do this. It is still
> installed here and still works.
> 
> Reproducer:
> 
>   $ cat /sys/power/mem_sleep
>   s2idle [deep]
>   $ sudo rtcwake -m mem -s 30
> 
> Machine powers off. Same result from closing the lid or from
> systemctl suspend. 3 for 3 on 6.12.96.
> 
> The journal ends mid-suspend with no resume and no panic:
> 
>   systemd-sleep[2973]: Performing sleep operation 'suspend'...
>   kernel: PM: suspend entry (deep)
>   <end of boot>
> 
> No "PM: suspend exit". Nothing in /sys/fs/pstore. On two of the three
> failures the "PM: suspend entry (deep)" line never made it to disk at all,
> which I read as power being cut before the journal could flush.
> 
> Counting entry/exit pairs across boots on this machine:
> 
>   kernel     deep    s2idle   resumes
>   6.12.95    1987    1282     3269      (entries and exits match exactly)
>   6.12.96       3       2        2      (all 3 deep attempts lost the machine)
> 
> The 6.12.95 numbers are high because I had been running suspend stress loops
> while chasing an unrelated brcmfmac problem. Every one of those 3269 cycles
> resumed. The kernel upgrade is the only change between the working and
> broken boots.
> 
> Workaround: mem_sleep_default=s2idle on the kernel command line. s2idle
> suspends and resumes reliably on 6.12.96, so whatever broke is specific to
> the S3 path. Costs battery on this hardware, but it beats losing the session.
> 
> Ruled out:
> 
> - Not systemd. Suspend gets past systemd-sleep and into the kernel's S3
>   path before dying, so this is not systemd/systemd#38337.
> - Not config. No changes to logind.conf, sleep.conf, or /etc/default/grub
>   between the last working boot and the first broken one.
> - Not firmware. No BIOS update; 1.13.0 from 2020 throughout.
> 
> Timeline: 6.12.96-1 installed 2026-07-21, first booted 2026-07-26. The delay
> is why it initially looked unrelated to the upgrade.

Can you please bisect the changes between 6.12.95 and 6.12.96 to
identify the breaking change?

Regards,
Salvatore

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#93514 — Processed: Re: Bug#1142863: linux-image-6.12.96+deb13-amd64: S3 (deep) suspend powers the machine off instead of suspending

Processing control commands:

> tags -1 + moreinfo
Bug #1142863 [src:linux] linux-image-6.12.96+deb13-amd64: S3 (deep) suspend powers the machine off instead of suspending
Added tag(s) moreinfo.

-- 
1142863: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1142863
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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