Re: Kernel 2.6.8 and DELL's DOTHAN Processor B0

[michel . mengis]

I already tried to put all scaling_govenors... nothing changed... coz
scaling_max_freq is set to 600000 and not to 1700000. ;(

Michel.

Selon Con Kolivas <lkml@xxxxxxxxxxx>:

> michel.mengis@xxxxxxx wrote:
> >
> > Hi all,
> >
> > I have a lot of trouble to bring the kernel 2.6.8-1 to detect my dothan
> > processor.
> > It's a Pentium M Dothan B0 version, 1.7Ghz/600Mhz.
> > The BIOS is DELL's D800 Bios version 09.
> >
> > I added 3 patches:
> > cpufreq-speedstep-dothan-3.patch :add correct frequency table in
> speedstep.c
> > dothan-speedstep-fix.patch : add correct Level2 cache
> > bk-cpufreq.patch : from http://linux-dj.bkbits.net/cpufreq
> >
> > I added a lot of output in speedstep-centrino.c, acpi/processor.c to track
> the
> > problem.
> >
> > I notice that my computer is running always in the lowest speed evenif I'm
> > stressing it... All ouputs I added show me that Speedstep isn't the cause,
> > neither CPUFreq but while CPUFreq calls all notifiers, acpi/processor.c's
> > CPUFREQ_INCOMPATIBLE change the max speed to the lowest evenif during
> > cpufreq_acpi_cpu_init the max speed is well detected.
> > Seems to be like it's coz at boot time the kernel doesn't detect correctly
> the
> > max speed.
> > dmesg shows me that a 600Mhz processor has been detected only and not
> 1.7Ghz.
> > (on my D600 pentium M not dothan, it detects correctly 1.6Ghz)
> >
> > is there a fix for that ?
> > is it a known bug ?
> >
> > thx for all help I can get,
>
> Sounds like you've chosen powersave as the default power governor in
> your config. Change it to performance or modify it manually in
> /sys/devices.... cpufreq/scaling_governor
> (cant remember the exact position; you'll find it)
>
> cat the output of that file and see if it says powersave performance or
> ondemand. You can manually change it from one to the other, or set
> either powersave or performance in your config during kernel config.
>
> Cheers,
> Con
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