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

[Evgeny Sagatov]

Hello Rafael,

I applied the patch that you sent.
The PC isn't responding to the power button press. It doesn't freeze.

I just want to clarify, did you receive messages where we found the
first broken commit using git bisect?

> 8c94ccc7cd691472461448f98e2372c75849406c    good
> e37617c8e53a1f7fcba6d5e1041f4fd8a2425c27    good
> b0d326da462e20285236e11e4cbc32085de9f363    bad

I'm getting messages that my emails couldn't be delivered, so I'm
using another email address.

----
Sincerely, Evgeny Sagatov

> On Tuesday, April 21, 2026 5:11:36 PM CEST Wysocki, Rafael J wrote:
>
>  Hi,
>
>  On 4/13/2026 6:46 PM, Evgeny Sagatov wrote:
>  > Hello,
>  > I have a PC with a motherboard GA-EP45T-UD3LR (Rev. 1.0)
>  > <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.
>
>  It looks like the ACPI button notify handler crashes on your system for
>  some obscure reason.
>
>  It should be possible to get to the bottom of it, but it will require
>  some investigation if you have the motivation and time to run debug patches.
>
>
>  > 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.
>  > If I unload the "button" module, the system doesn't freeze, but it
>  > also doesn't shut down.
>
>  This is a useful data point, thanks!
>
>
>  > I built "button" module by rolling back its version to commit 1a20d40
>  > <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/commit/0d51157dfaac05ea66616d8a250dce04bef49a4f>.
>
>  The main difference made by it is the fixed events handling and if there
>  is a problem with that, a few debug patches should suffice to find out
>  what's going on. I'll send you one to try shortly.
>
>
> First off, on top of 7.0.0 (since the issue is present in this one, I think
> it's better to focus the debugging on it), let's first check what happens if
> the ACPI fixed event handler is not installed for the power button at all.
>
> This should be similar to using a 6.1 version of the button driver (that is,
> no crash, but pressing the power button will have no effect).
>
> Please test the patch below and let me know what happens.
>
> ---
>  drivers/acpi/button.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> --- a/drivers/acpi/button.c
> +++ b/drivers/acpi/button.c
> @@ -628,9 +628,7 @@ static int acpi_button_probe(struct plat
>
>          switch (device->device_type) {
>          case ACPI_BUS_TYPE_POWER_BUTTON:
> - status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
> - acpi_button_event,
> - button);
> + status = AE_OK;
>                  break;
>          case ACPI_BUS_TYPE_SLEEP_BUTTON:
>                  status = acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
>
>
>
>
>
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