From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756790Ab0CLIuA (ORCPT ); Fri, 12 Mar 2010 03:50:00 -0500 Received: from mail-fx0-f227.google.com ([209.85.220.227]:62162 "EHLO mail-fx0-f227.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756678Ab0CLIt5 convert rfc822-to-8bit (ORCPT ); Fri, 12 Mar 2010 03:49:57 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Qs9CmsgAXAZqoGcj72I8n3ApwEcGgpzYdtanvSu42Am+J/uuULleaMyWgJofh4kFoj qD6jzEPExent/1tK+QuDlr3nBCYB3gO+5ZBzpaG3n7ejwBqC/n82SRVmLOLMziN+X5x8 ZJm+uPbjvkQ/cKeaxSB3EguzszlKnV4sFwyj0= MIME-Version: 1.0 In-Reply-To: References: Date: Fri, 12 Mar 2010 09:49:55 +0100 Message-ID: <71cd59b01003120049n1a9fbbf3qfd37f14f241a7f64@mail.gmail.com> Subject: Re: Possible bug in eeepc-laptop.c - EeePC 900 From: Corentin Chary To: Fabio Comolli Cc: ACPI mailing list , Linux Kernel Mailing List , Len Brown Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 11, 2010 at 10:28 PM, Fabio Comolli wrote: > Hi. > > 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: > >        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 > Thanks for the report, Could you try to add a quick printk to show the value stored in set_acpi(CM_ASL_CPUFV, value); ? And also, could you send the result of acpidump ? Thanks, -- Corentin Chary http://xf.iksaif.net