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SubjectRe: Possible bug in eeepc-laptop.c - EeePC 900

On Tue, Mar 9, 2010 at 11:58 PM, Fabio Comolli <> wrote:
> Hi.
> I have an EeePC 900 running 2.6.34-rc1.
> If I boot it on AC the cpu runs at full speed, 900MHz; if I boot it on
> battery it runs only at 630Mhz. Plugging / unplugging the AC does not
> change the cpu frequency. Only a reboot can change the situation.
> I already tried to echo 0 or 1 to the
> /sys/devices/platform/eeepc/cpufv file; no effects, even if the file
> changes its value.
> This is not a regression from 2.6.33: this behavior is also present in
> that version.
> Does this ring any bells? This is really annoying, especially when
> trying to watch a movie on battery. Also 3D apps show a 30%
> performance drop, as expected.
> Regards,
> Fabio

Well, it turns out that this is indeed a regression, but I don't know
from which kernel version.
I reverted (not cleanly) this patch:

and now

echo 1 > /sys/devices/platform/eeepc/cpufv

enables the powersave mode and

echo 0 > /sys/devices/platform/eeepc/cpufv

enables the performance mode.

Tested with the non-benchmark glxgears (275 frames/sec in powersave
mode and 405 in performance mode) and stellarium (14 frames and 20


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