From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751614Ab1DWRAI (ORCPT ); Sat, 23 Apr 2011 13:00:08 -0400 Received: from moutng.kundenserver.de ([212.227.17.10]:63869 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751108Ab1DWRAE (ORCPT ); Sat, 23 Apr 2011 13:00:04 -0400 Message-ID: <4DB3058F.5020400@online.de> Date: Sat, 23 Apr 2011 18:59:59 +0200 From: Denis Washington User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Lightning/1.0b3pre Thunderbird/3.1.9 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Reverse-engineer GPU fan control method on Toshiba Satellite L500? Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V02:K0:0Myq7Gbp6G9uMoBfGHp1bLg2kJZa0HwD9ybGsjpesdV 6v1upRO372YbiARuUHYGg5WUSFlRAdU2IkSU+/XNDq4aLMZOI4 vAy9YMLzp7g0qQ19baFZIeEneU7uWWZlqer6pqs0n4xQ3Xznlc S0AUtJD3mBXkjS9uChVW9TL3jykH4+liGjoq8bBJJniO2ETZjO 5DxPQIdzH/h4sRGMnYR7pMFR3hr5xngoht/rXi4LUQ= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, I have a Toshiba Satellite L500-164 (PSLJ3E) whose GPU fan (AMD Radeon HD 4650) keeps spinning loudly without slowing down when using the radeon driver. The propietary fglrx driver controls the fan correctly, though, so there must be a way to control it. However, I don't know how the needed information and/or operations are exposed by the laptop; lm-sensors detects no gpu-internal i2c thermal sensor (as would be supported by the radeon driver) and /sys/class/thermal shows no thermal zones. (Tested with today's mainline kernel.) How can I find out how GPU fan control works on this laptop, e.g. if there is a Toshiba-specific ACPI interface for this? I am annoyed enough by this problem to do the needed reverse engineering research and at least help with the coding as much as I can, but I really don't know how to start. Any pointers would be welcome. (Please CC me when replying, as I am not subscribed to the lkml.) Regards, Denis Washington