Re: cpufreq stops working after a while

[Mark Lord]

Andrew Morton wrote:
> On Fri, 11 Aug 2006 14:25:26 -0400
> Mark Lord <lkml@xxxxxx> wrote:
>
> > One of my notebooks (Dell Latitude X1) has a 1.1GHz Pentium-M ULV processor.
> > This chip can change CPU speeds from 600 -> 800 -> 1100 Mhz.
> >
> > I use speedstep-centrino with it, and after boot all is usually okay.
> > But after a few hours of operation, it stops shifting to the highest frequency
> > even under continuous 100% load (or not).  Eventually it gets stuck at 600Mhz
> > and stays there until I reboot.
> >
> > Sometimes rebooting doesn't even restore it.
> >
> > /sys/devices/system/cpu/cpu0/cpufreq is all very normal looking,
> > showing the available frequencies and other info.  All of the attribs
> > there look fine, except for "scaling_max_freq", which is what seems
> > to gradually get set smaller.  For instance, right now it is set to 800000,
> > and it won't let me change it (echo 11000000 > scaling_max_freq has no effect.
> >
> > WHY?
>
> cpufreq seems to have relatively frequent problems.
>
> >  And how can I fix it?
>
> You could start by telling us which kernel versions are affected ;)


Mmm.. since it appears to be related, kbuild dumps this out when building the kernel:

WARNING: drivers/acpi/processor.o - Section mismatch: reference to .init.data: from .text between 'acpi_processor_power_init' (at offset 0xf29) and 'acpi_processor_cst_has_changed'

A possible source for the bug, or total red herring ?
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