Re: Pressing the power button causes the device to freeze completely

[Thorsten Leemhuis]

On 4/16/26 19:22, Evgeny Sagatov wrote:
>> Could you please try 7.0 as well?
> I compiled 7.0.0 kernel from sources.
> Unfortunately, this kernel also freezes when the power button is pressed.

Thx for testing.
  
>> How did you find that this causes the problem? Did you do a proper
> bisection and thus checked if the parent of that commit really works?
>  
> I don't think I did it correctly.
> Because the previous commits didn't shut down the PC or cause it to
> freeze. I think they just weren't working.
>  
> I also tried a very simple module tity-power-button. Pressing the power
> button when using this module also causes a full freeze.
> I think the problem lies with the ACPI functionality, but none of kernel
> options helped fix it.
>  
> I'm confused.

Then you likely want to properly bisect the bug. Might be best to do
that on a Debian 12 install (where everything used to be working) by
following this guide:

https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html

But be warned: the regression is old. Even if the culprit is identified
the usual rules wrt to "no regression" might not apply, as fixing the
regression could cause regressions for other users.

Ciao, Thorsten

> ----------------
> Кому: Evgeny Sagatov (sagatov@xxxxx), Rafael J. Wysocki
> (rafael.j.wysocki@xxxxxxxxx);
> Копия: regressions@xxxxxxxxxxxxxxx, LKML (linux-kernel@xxxxxxxxxxxxxxx),
> Michal Wilczynski (michal.wilczynski@xxxxxxxxx);
> Тема: Pressing the power button causes the device to freeze completely;
> 16.04.2026, 11:23, "Thorsten Leemhuis" <regressions@xxxxxxxxxxxxx>:
> 
>     [removing the stable list, this is not something for them]
> 
>     On 4/13/26 18:46, Evgeny Sagatov wrote:
> 
>          I have a PC with a motherboard GA-EP45T-UD3LR (Rev. 1.0) <https://
>          www.gigabyte.com/Motherboard/GA-EP45T-UD3LR-rev-10 <https://
>         www.gigabyte.com/Motherboard/GA-EP45T-UD3LR-rev-10>> and
>         processor Intel
>          Core 2 Quad Q9550.
>          Previously, I had Debian 12 with kernel 6.1 installed, and
>         pressing the
>          power button would shut down the PC as usual.
>          I updated to Debian 13 with kernel 6.12.74, and now pressing
>         the power
>          button causes the PC to freeze completely.
>           
>          I see that systemd doesn't even begin to shut down. It freezes
>          immediately after pressing the button. There's no error message in
>          console. There's no error message in the logs either.
>         Netconsole doesn't
>          report any errors, and the kernel doesn't panic. It just
>         freezes completely.
>           
>          I checked that Live CD with Debian 12 continue to shut down
>         normally,
>          but Live CD with Debian 13 freeze.
>          I tried updating and resetting the BIOS. I tried various kernel
>          parameters related to ACPI settings. I also tried kernels 6.18
>         and 6.19.
>          Nothing fixed the problem.
> 
> 
>     Could you please try 7.0 as well? It contains a fix for the commit you
>     mentioned below.
>      
> 
>           
>          If I unload the "button" module, the system doesn't freeze, but
>         it also
>          doesn't shut down.
>          I built "button" module by rolling back its version to commit
>         1a20d40
>          <https://github.com/torvalds/linux/ <https://github.com/
>         torvalds/linux/>
>          commit/1a20d409c874255086e2f42a729826d490294c91>, which
>         corresponds to
>          kernel version 6.1. This module does not freeze, but does not
>         turn off
>          the PC either.
>           
>          I've found that the freezes have been occurring since commit
>         0d51157
>          <https://github.com/torvalds/linux/ <https://github.com/
>         torvalds/linux/>
>          commit/0d51157dfaac05ea66616d8a250dce04bef49a4f>.
> 
> 
>     That is 0d51157dfaac05 ("ACPI: button: Eliminate the driver notify
>     callback") [v6.5-rc1] from Rafael. But that is a very old commit; and
>     you seem to be switching distro versions and kernel at the same time,
>     which could interfere.
> 
>     How did you find that this causes the problem? Did you do a proper
>     bisection and thus checked if the parent of that commit really works?
>      
> 
>          Unfortunately, my skills are not enough to understand the
>         reason for the
>          freeze.
>           
>          I'm attaching dmesg and lspci logs.
> 
>     Ciao, Thorsten
>