linux-kernel - Re: Possible bug in eeepc-laptop.c

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Message-ID: <b637ec0b1003100546l121f3a54o311aba94c8cabc5e@mail.gmail.com>
Date:	Wed, 10 Mar 2010 14:46:19 +0100
From:	Fabio Comolli <fabio.comolli@...il.com>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	ACPI mailing list <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: Possible bug in eeepc-laptop.c - EeePC 900

Hi.

On Wed, Mar 10, 2010 at 2:07 PM, Corentin Chary
<corentin.chary@...il.com> wrote:
> On Tue, Mar 9, 2010 at 11:58 PM, Fabio Comolli <fabio.comolli@...il.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.
>
> Can you change the frequency with cpufreq ?

No, I can't. Which cpufreq driver am I supposed to use? With only
cpufreq compiled in, the directory
/sys/drivers/system/cpu/cpu0/cpufreq is empty.

> Did you try all cpufv values (see cpufv_available file) ?

Yes, it only shows 0 and 1. I tried both, without success.

> Is you bios up-to-date ?

Yes it is, it's 1006.

>
> --
> Corentin Chary
> http://xf.iksaif.net
>

Thanks.
Fabio
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