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Bug#880203: marked as done (After suspend&resume, cpufreq/scaling_max_freq is ignored)

Your message dated Tue, 31 Oct 2017 10:36:59 +0000
with message-id <1509446219.2748.35.camel@decadent.org.uk>
and subject line Re: Fwd: Re: Bug#880203: After suspend&resume, cpufreq/scaling_max_freq is ignored
has caused the Debian Bug report #880203,
regarding After suspend&resume, cpufreq/scaling_max_freq is ignored
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
880203: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=880203
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-image-4.9.0-4-amd64
Version: 4.9.51-1
To avoid fan noise, I set up my laptop such that it sets a low CPU frequency upon boot via
for i in `seq 0 7`; do echo 1200000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq; done 

in a startup script.
This all goes well until I make a break in my work by closing the laptop lid (which then suspends the laptop) and resuming later. After resume, we still have low frequency in scaling_max_freq, but this setting is ignored:
$ for i in `seq 0 7`; do cat /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq; done 
1200000
1200000
1200000
1200000
1200000
1200000
1200000
1200000
$ cat /proc/cpuinfo | grep MHz
cpu MHz         : 1899.853
cpu MHz         : 1900.964
cpu MHz         : 1899.853
cpu MHz         : 1899.853
cpu MHz         : 1899.853
cpu MHz         : 1899.853
cpu MHz         : 1899.853
cpu MHz         : 947.546
$ for i in `seq 0 7`; do cat /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor; done 
powersave
powersave
powersave
powersave
powersave
powersave
powersave
powersave
Moreover, the fan kicks in, and the laptop feels to run without speed restrictions (noisy fan, etc.) 

Any bugfix?

Thanks in advance,
Leon

--- End Message ---
--- Begin Message --- 
On Tue, 2017-10-31 at 11:14 +0100, Leon Meier wrote:
[...]
> However, the cpufreq driver is not loaded in my case:

It's built-in, not a module.

[...]
> The current behavior might be expected from the viewpoint of the 
> processor and of the embedded controller; I don't wish to question that. 
> But, from the viewpoint of the user, this is extremely, overly 
> _counterintuitive_. 
[...]

Yes, but that doesn't mean we can do anything about it.

Ben.

-- 
Ben Hutchings
It is a miracle that curiosity survives formal education. - Albert
Einstein

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