Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754219Ab0LAC66 (ORCPT ); Tue, 30 Nov 2010 21:58:58 -0500 Received: from mail-gy0-f174.google.com ([209.85.160.174]:51412 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753841Ab0LAC65 (ORCPT ); Tue, 30 Nov 2010 21:58:57 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=P5NovFb5wjcJHeibDUOBxVGFdKE9czXoQd7qknkblBbHjyaTZVWJn3FTwawfFKD8Wg yxgdCOcU5JJs/az4dqZWDVEJl0ZZar7XcdqmIsPrTJissVNKtiXZdM7/CFhA+e7dZ9kM QXDWTZPKRMTisqwwNbkA6I73RBKK18zo8OtFg= Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work From: Calvin Walton To: Lukas Hejtmanek Cc: linux-kernel@vger.kernel.org In-Reply-To: <20101130185303.GI10354@ics.muni.cz> References: <20101130185303.GI10354@ics.muni.cz> Content-Type: text/plain; charset="UTF-8" Date: Tue, 30 Nov 2010 21:58:44 -0500 Message-ID: <1291172324.14274.33.camel@nayuki> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1391 Lines: 31 On Tue, 2010-11-30 at 19:53 +0100, Lukas Hejtmanek wrote: > Hi, > > in 2.6.26, mute button worked as expected on my ThinkPad T61 - it toggled > mute with mixer applet notification. In 2.6.37-rc1, it only mutes without any > event to any mixer applet. The mute button on this series of Thinkpads is a little weird (I have an R61i, which is the same iirc) - the behaviour of the button depends on the ACPI firmware. With no operating system running, it behaves as a persistent hardware mute. Windows apparently uses a proprietary driver to control the volume - part of this functionality has been added to the Linux thinkpad_acpi driver, but it's not fully enabled yet. By default on this series of laptops, Linux runs with the ACPI _OSI(Linux) exported - when the bios of this laptop model sees that it's running on Linux, it disables the hardware mute functionality and the mute button acts as a standard keyboard key. Search your dmesg for lines containing '_OSI(Linux)' - it should say that a BIOS query was honoured. Make sure you do not have 'acpi_osi="! Linux"' on your kernel command line. -- Calvin Walton -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/