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

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Date:	Tue, 9 Mar 2010 23:58:47 +0100
From:	Fabio Comolli <fabio.comolli@...il.com>
To:	ACPI mailing list <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Len Brown <lenb@...nel.org>,
	Corentin Chary <corentin.chary@...il.com>
Subject: Possible bug in eeepc-laptop.c - EeePC 900

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
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