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

["Rafael J. Wysocki" <rafael@kernel.org>]

On Wed, Apr 22, 2026 at 3:34 PM Evgeny Sagatov <evgeny.sagatov@gmail.com> wrote:
>
> # grep -r . /sys/devices/system/cpu/cpufreq/
> /sys/devices/system/cpu/cpufreq/schedutil/rate_limit_us:240
> /sys/devices/system/cpu/cpufreq/policy2/scaling_min_freq:2000000
> /sys/devices/system/cpu/cpufreq/policy2/scaling_available_governors:performance
> schedutil

There are two cpufreq governors to choose from.  Have you decided to
compile out the other ones on purpose?

It might be useful to compile the powersave governor in and try to
switch over to it (on all CPUs) before pressing the power button
(without any patches applied).

> /sys/devices/system/cpu/cpufreq/policy2/freqdomain_cpus:2
> /sys/devices/system/cpu/cpufreq/policy2/scaling_governor:schedutil
> /sys/devices/system/cpu/cpufreq/policy2/cpuinfo_max_freq:2834000
> /sys/devices/system/cpu/cpufreq/policy2/scaling_available_frequencies:2834000
> 2000000

The frequency scaling on this CPU is quite limited (only 2 states to
choose from).

> /sys/devices/system/cpu/cpufreq/policy2/related_cpus:2
> /sys/devices/system/cpu/cpufreq/policy2/scaling_cur_freq:2000088

Interestingly, this number doesn't match the available choices (maybe
due to a rounding error or similar).

> /sys/devices/system/cpu/cpufreq/policy2/scaling_setspeed:<unsupported>
> grep: /sys/devices/system/cpu/cpufreq/policy2/stats/reset: Access denied
> /sys/devices/system/cpu/cpufreq/policy2/stats/trans_table:   From  :    To
> /sys/devices/system/cpu/cpufreq/policy2/stats/trans_table:         :
> 2834000   2000000
> /sys/devices/system/cpu/cpufreq/policy2/stats/trans_table:  2834000:
>       0       762
> /sys/devices/system/cpu/cpufreq/policy2/stats/trans_table:  2000000:
>     761         0
> /sys/devices/system/cpu/cpufreq/policy2/stats/total_trans:1523
> /sys/devices/system/cpu/cpufreq/policy2/stats/time_in_state:2834000 6606
> /sys/devices/system/cpu/cpufreq/policy2/stats/time_in_state:2000000 248733
> /sys/devices/system/cpu/cpufreq/policy2/affected_cpus:2
> /sys/devices/system/cpu/cpufreq/policy2/scaling_max_freq:2834000
> /sys/devices/system/cpu/cpufreq/policy2/cpuinfo_transition_latency:160000
> /sys/devices/system/cpu/cpufreq/policy2/scaling_driver:acpi-cpufreq
> /sys/devices/system/cpu/cpufreq/policy2/cpuinfo_min_freq:2000000
> /sys/devices/system/cpu/cpufreq/policy2/bios_limit:2834000

The fact that acpi-cpufreq is the scaling driver may be related to the
power button issue in principle.

I'm still going to send you another debug patch for the button driver though.