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* Re: Possible bug in eeepc-laptop.c - EeePC 900
@ 2010-03-11 21:28 Fabio Comolli
  2010-03-12  8:49 ` Corentin Chary
  0 siblings, 1 reply; 16+ messages in thread
From: Fabio Comolli @ 2010-03-11 21:28 UTC (permalink / raw)
  To: ACPI mailing list, Linux Kernel Mailing List, Corentin Chary; +Cc: Len Brown

Hi.

On Tue, Mar 9, 2010 at 11:58 PM, Fabio Comolli <fabio.comolli@gmail.com> 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:

        http://patchwork.kernel.org/patch/28591

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
frames).

Regards,
Fabio

^ permalink raw reply	[flat|nested] 16+ messages in thread
* Possible bug in eeepc-laptop.c - EeePC 900
@ 2010-03-09 22:58 Fabio Comolli
  2010-03-10 13:07 ` Corentin Chary
  0 siblings, 1 reply; 16+ messages in thread
From: Fabio Comolli @ 2010-03-09 22:58 UTC (permalink / raw)
  To: ACPI mailing list, Linux Kernel Mailing List; +Cc: Len Brown, Corentin Chary

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

^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2010-03-17 22:55 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-03-11 21:28 Possible bug in eeepc-laptop.c - EeePC 900 Fabio Comolli
2010-03-12  8:49 ` Corentin Chary
2010-03-12 20:07   ` Fabio Comolli
2010-03-13  9:16     ` Corentin Chary
2010-03-13 12:50       ` Fabio Comolli
2010-03-16  6:54         ` Corentin Chary
2010-03-16 20:31           ` Fabio Comolli
2010-03-17  8:22             ` Corentin Chary
2010-03-17 22:55               ` Fabio Comolli
2010-03-17 14:49         ` Alan Jenkins
2010-03-17 15:40           ` Fabio Comolli
  -- strict thread matches above, loose matches on Subject: below --
2010-03-09 22:58 Fabio Comolli
2010-03-10 13:07 ` Corentin Chary
2010-03-10 13:46   ` Fabio Comolli
2010-03-10 22:09     ` Fabio Comolli
2010-03-10 22:19       ` Fabio Comolli

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