linux-kernel - Re: cpufreq limits avilable frequencies to 800MHz on git kernel

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Date:	Sun, 25 May 2008 17:03:55 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Arkadiusz Miskiewicz <arekm@...en.pl>
Cc:	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk,
	Andrew Morton <akpm@...ux-foundation.org>, gnorton@...ell.com,
	miguel@...ell.com
Subject: Re: cpufreq limits avilable frequencies to 800MHz on git kernel

On Sun, 2008-05-25 at 11:36 +0200, Arkadiusz Miskiewicz wrote:
> On Saturday 24 May 2008, Andrew Morton wrote:
> > On Fri, 23 May 2008 19:44:57 +0200 Arkadiusz Miskiewicz <arekm@...en.pl> 
> wrote:
> > > thinkpad z60m, Intel(R) Pentium(R) M processor 2.00GHz. kernel from git
> > > from 1-2 days ago.
> > >
> > > Unfortunately it seems that suspend to ram/resume causes frequency
> > > to be limited to 800MHz only. I can't set it to 2GHz again :-/
> > >
> > > scaling_max_freq is then 800000 and cannot be changed.
> > >
> > > reboot and the problem disappears until new suspend/resume cycle.
> > >
> > > cpufreq stuff is driven by acpi-cpufreq
> > >
> > > $ cpufreq-info
> > > cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
> > > Report errors and bugs to linux@...do.de, please.
> > > analyzing CPU 0:
> > >   driver: acpi-cpufreq
> > >   CPUs which need to switch frequency at the same time: 0
> > >   hardware limits: 800 MHz - 2.00 GHz
> > >   available frequency steps: 2.00 GHz, 1.60 GHz, 1.33 GHz, 1.07 GHz, 800
> > > MHz available cpufreq governors: powersave, userspace, ondemand,
> > > performance current policy: frequency should be within 800 MHz and 800
> > > MHz. The governor "performance" may decide which speed to use within this
> > > range.
> > >   current CPU frequency is 800 MHz.
> > >
> > > /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0
> > > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:800000
> > > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:2000000
> > > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:800000
> > > /sys/devices/system/cpu/cpu0/cpufreq/related_cpus:0
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:200000
> > >0 1600000 1333000 1066000 800000
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:powersav
> > >e userspace ondemand performance
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:800000
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:acpi-cpufreq
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:performance
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:800000
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:800000
> > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:<unsupported>
> >
> > Thanks.  Is this a newly-occurring bug or did earlier kernels do this also?
> >
> > If it was newly added, do you know in which kernel version we might
> > have added it?
> 
> I wasn't able to reproduce the problem on final 2.6.24 but was able to 
> reproduce on final 2.6.25. Problem introduced somewhere between it seems.
> 
> Note that 2-3 suspend to ram/resume cycles is needed to get into the problem.

Sounds related to:
[Bug 374099] T61p speedstep problems (ondemand scheduler)
https://bugzilla.novell.com/show_bug.cgi?id=374099

Miguel speaks from "good boots" and "bad boots".

Could you check whether the OS thinks it is too hot.
I described some basics how to monitor temperature and cpufreq (if
passive cooling kicks in) here:
https://bugzilla.novell.com/show_bug.cgi?id=387702#c13

Hmm, it may just have been fixed by this one:
commit e56a727b023d40d1adf660168883f30f2e6abe0a
Author: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Date:   Mon Apr 28 15:13:43 2008 -0400

Miguel, Geoff: This is already in 11.0 for some time and in 10.3 for
some days.

       Thomas

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