bug#37904: CPU overheating on recent laptops

[Arne Babenhauserheide]

Ludovic Courtès <address@hidden> writes:
>> For laptops and other battery-powered devices, ‘conservative’ is
>> preferred over ‘ondemand’.  It's probably a sane default choice for
>> all.

> --8<---------------cut here---------------start------------->8---
> $ cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors
> performance powersave

> $ uname -a
> Linux ribbon 5.3.7-gnu #1 SMP 1 x86_64 GNU/Linux
> --8<---------------cut here---------------end--------------->8---
>
> Do you see more governors on your side?  How could that be?

Do you have a recent Intel CPU? From what I know they removed support
for conservative, because their powersave is in fact conservative.

Also they don’t necessarily stick to the frequency you set for them. To
ensure that they keep the frequency, I have a script running that sets
the speed every minute:

(define cpupower-powersave-job
  ;; Set the governor to powersave every minute.
  ;; The job's action is a shell command.
  ;; TODO: migrate to clearer syntax:   #~(job '(next-hour '(3)) (string-append 
#$btrfs-progs "/bin/btrfs scrub start -c 3 /")))
  #~(job "* * * * *"            ;Vixie cron syntax
         "cpupower frequency-set -g powersave -u 1200000")) ;; use powersave 
governor with a maximum frequency of 1200MHz

(this is a problem which also hits other distributions)

Best wishes,
Arne
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