Re: Pressing the power button causes the device to freeze completely (schedutil involved)

[Evgeny Sagatov]

I forgot to say that in ondemand mode, when I pressed the power
button, the PC did not freeze.

чт, 30 апр. 2026 г. в 14:41, Evgeny Sagatov <evgeny.sagatov@xxxxxxxxx>:
>
> I noticed that for powersave mode, I'm getting the following values:
> cat /proc/cpuinfo | grep MHz
> cpu MHz         : 2798.689
> cpu MHz         : 1999.659
> cpu MHz         : 1999.797
> cpu MHz         : 2741.103
> Also, there's now no difference in the single-core benchmark between
> schedutil, ondemand, powersave and performance modes. The benchmark
> always gives a very high result.
> This wasn't the case before; the modes had different performance levels.
>
> I switched to ondemand, did a reset and waited a few minutes:
> grep -r . /sys/devices/system/cpu/cpufreq/
> /sys/devices/system/cpu/cpufreq/ondemand/up_threshold:95
> /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load:0
> /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor:1
> /sys/devices/system/cpu/cpufreq/ondemand/powersave_bias:0
> /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate:8000
> /sys/devices/system/cpu/cpufreq/ondemand/io_is_busy:1
> /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq:2000000
> /sys/devices/system/cpu/cpufreq/policy0/scaling_available_governors:ondemand
> performance schedutil
> /sys/devices/system/cpu/cpufreq/policy0/freqdomain_cpus:0 1 2 3
> /sys/devices/system/cpu/cpufreq/policy0/scaling_governor:ondemand
> /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq:2834000
> /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies:2834000
> 2000000
> /sys/devices/system/cpu/cpufreq/policy0/related_cpus:0 1 2 3
> /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq:2000000
> /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed:<unsupported>
> grep: /sys/devices/system/cpu/cpufreq/policy0/stats/reset: Access denied
> /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:   From  :    To
> /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:         :
> 2834000   2000000
> /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:  2834000:
>       0        80
> /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:  2000000:
>      80         0
> /sys/devices/system/cpu/cpufreq/policy0/stats/total_trans:160
> /sys/devices/system/cpu/cpufreq/policy0/stats/time_in_state:2834000 397
> /sys/devices/system/cpu/cpufreq/policy0/stats/time_in_state:2000000 68525
> /sys/devices/system/cpu/cpufreq/policy0/affected_cpus:0 1 2 3
> /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq:2834000
> /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_transition_latency:160000
> /sys/devices/system/cpu/cpufreq/policy0/scaling_driver:acpi-cpufreq
> /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq:2000000
> /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_avg_freq:2000000
> /sys/devices/system/cpu/cpufreq/policy0/bios_limit:2834000
>
> чт, 30 апр. 2026 г. в 13:53, Rafael J. Wysocki <rafael@xxxxxxxxxx>:
> >
> > On Thu, Apr 30, 2026 at 12:40 PM Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote:
> > >
> > > On Wed, Apr 29, 2026 at 11:17 PM Evgeny Sagatov
> > > <evgeny.sagatov@xxxxxxxxx> wrote:
> > > >
> > > > The PC froze when I pressed the power button.
> > >
> > > Well, we need to dig more I guess.
> > >
> > > > grep -r . /sys/devices/system/cpu/cpufreq/
> > > > /sys/devices/system/cpu/cpufreq/schedutil/rate_limit_us:240
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq:2000000
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_available_governors:performance
> > > > schedutil
> > > > /sys/devices/system/cpu/cpufreq/policy0/freqdomain_cpus:0 1 2 3
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor:schedutil
> > > > /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq:2834000
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies:2834000
> > > > 2000000
> > > > /sys/devices/system/cpu/cpufreq/policy0/related_cpus:0 1 2 3
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq:1999759
> > >
> > > This kind of calls for some investigation.  It should not be less than
> > > scaling_min_freq, even though this looks like a rounding error.
> > >
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_setspeed:<unsupported>
> > > > grep: /sys/devices/system/cpu/cpufreq/policy0/stats/reset: Отказано в доступе
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:   From  :    To
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:         :
> > > > 2834000   2000000
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:  2834000:
> > > >       0       844
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/trans_table:  2000000:
> > > >     843         0
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/total_trans:1687
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/time_in_state:2834000 1164
> > > > /sys/devices/system/cpu/cpufreq/policy0/stats/time_in_state:2000000 14130
> > > > /sys/devices/system/cpu/cpufreq/policy0/affected_cpus:0 1 2 3
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq:2834000
> > > > /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_transition_latency:160000
> > > > /sys/devices/system/cpu/cpufreq/policy0/scaling_driver:acpi-cpufreq
> > > > /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq:2000000
> > > > /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_avg_freq:1999759
> > > > /sys/devices/system/cpu/cpufreq/policy0/bios_limit:2834000
> > >
> > > So with the same patch applied (because I think that the one-policy
> > > configuration is suitable for this platform), please capture the
> > > output of
> > >
> > > grep -r . /sys/devices/system/cpu/cpufreq/
> >
> > Actually, the step above isn't necessary.
> >
> > > switch over to the ondemand governor,
> >
> > It is better to reset the cpufreq statistics after switching over to
> > ondemand by writing 1 to
> >
> > /sys/devices/system/cpu/cpufreq/policy0/stats/reset
> >
> > as root.  Then, wait for some time and capture the output of
> >
> > grep -r . /sys/devices/system/cpu/cpufreq/
> >
> > just once.
> >
> > > wait for some time, capture the
> > > output of the above command again and send both.
> > >
> > > Also, please send the output of
> > >
> > > grep . /sys/firmware/acpi/interrupts/sci*
> > >
> > > acquired after doing all of the above.
> > >
> > > You may as well check again if the power button works after switching
> > > to ondemand.