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

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

On Thursday, April 23, 2026 4:51:36 PM CEST Evgeny Sagatov wrote:
> I removed the previous patch and installed the new one in kernel 7.0.0.
> schedutil - complete freeze, no messages in the log
> performance - log message when pressing power button, doesn't reboot
> ondemand - log message when pressing power button, doesn't reboot
> 
> Log: apr 23 17:40:04 srv kernel: acpi-button LNXPWRBN:00: ACPI button event

There clearly is some unexpected interaction between the schedutil governor
(or generally what happens in cpufreq when it is used) and the ACPI power
button handling.  It looks like some memory gets corrupted when schedutil
runs and it is then tripped over by the power button handling code.

Kind of on a hunch, please see if the appended schedutil patch (either with
or without the previous patch applied) makes any difference.

---
 kernel/sched/cpufreq_schedutil.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -158,7 +158,7 @@ unsigned long get_capacity_ref_freq(stru
 	if (freq)
 		return freq;
 
-	if (arch_scale_freq_invariant())
+	if (arch_scale_freq_invariant() || policy->cur >= policy->cpuinfo.max_freq)
 		return policy->cpuinfo.max_freq;
 
 	/*