linux-kernel - Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work

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Message-ID: <20101203141358.GA6936@ics.muni.cz>
Date:	Fri, 3 Dec 2010 15:13:58 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	ming.m.lin@...el.com, robert.moore@...el.com, len.brown@...el.com
Cc:	Calvin Walton <calvin.walton@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work

Hi,

On Tue, Nov 30, 2010 at 09:58:44PM -0500, Calvin Walton wrote:
> > in 2.6.36, 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.

[...]

> 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.

The breaking commit is this one: b0ed7a915abac309fcb5a51bccd3782e3daa7417

This changes 
[    0.200241] ACPI: BIOS _OSI(Linux) query honored via DMI
to
[    0.200241] ACPI: BIOS _OSI(Linux) query honored via cmdline

which apparently does not work with Lenovo T61.

-- 
Lukáš Hejtmánek
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