RE: Amd Turion TL-52 X2 on Amilo PA 1510> No way to change Frequency!

[Thomas Renninger <trenn@suse.de>]

On Tue, 2007-05-29 at 14:42 -0500, Langsdorf, Mark wrote:
> > my cpufreq directory says:
> > 
> > cpuinfo_max_freq
> > 1600000

> > scaling_max_freq
> > 800000
> > 
> > so but i've already tried to change the scaling_max_freq to 
> > 1600000 but nothing happens @ su mode.
> > if i add an line with 
> > echo 1600000 > /sys/devices...../cpufreq/scaling_max_freq
> > at booting before entering init 1 modus ... nothing happens 
> > or it says directory or file not found.
Have you tried manually at some later stage, e.g. in init 3.
You may want to use:
cat /dev/zero >/dev/null
to set the processor under load and check:
scaling_cur_freq or /proc/cpuinfo for freq changes.
> > 
> > so im not able to change this file. 
> 
> I'm not even sure how the scaling_max and the cpuinfo_max
> can be different values.  Anyone else have any ideas?
This is when the frequency got limited. AFAIK for x86 there are only two
possibilities:
  - thermal (check "watch -n1 
    cat /proc/acpi/thermal_zone/*/{trip_points,temperature}")
    If the passive cooling trip point got exceeded passive cooling
    gets enabled (also stated in /proc/acpi/thermal_zone/*/state)
  - _PPC BIOS freq limitation
    Some BIOSes limit freq e.g. when working on battery.
    In some BIOSes this is configurable (-> check BIOS)
    There was a bug, that if booted with limited freq (e.g. on some
    BIOSes when booted on battery), you will never be able to reach
    max_freq again. This has been fixed in 2.6.22-rc1 or -rc2.

    If it's _PPC it could also be some other general ACPI breakage.

> By the way, what governor are you using?

Best is you try with ondemand governor, like that you can't forget
anything to set up in userspace.


   Thomas