From mboxrd@z Thu Jan 1 00:00:00 1970 From: Corentin Chary Subject: Re: Possible bug in eeepc-laptop.c - EeePC 900 Date: Wed, 10 Mar 2010 14:07:52 +0100 Message-ID: <71cd59b01003100507q79878fdan98e53cb4e705d2c2@mail.gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: Received: from mail-fx0-f219.google.com ([209.85.220.219]:51216 "EHLO mail-fx0-f219.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750996Ab0CJNHy (ORCPT ); Wed, 10 Mar 2010 08:07:54 -0500 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Fabio Comolli Cc: ACPI mailing list , Linux Kernel Mailing List , Len Brown 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. Can you change the frequency with cpufreq ? Did you try all cpufv values (see cpufv_available file) ? Is you bios up-to-date ? -- Corentin Chary http://xf.iksaif.net