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

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Message-ID: <20101201080850.GK10354@ics.muni.cz>
Date:	Wed, 1 Dec 2010 09:08:50 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Calvin Walton <calvin.walton@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work

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

Behaviour in 2.6.36 kernel is OK as expected. Something broken it in
2.6.37-rc1.

> 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.

[    0.000000] ACPI: DMI detected: Lenovo ThinkPad T61
[    0.000000] ACPI: Added _OSI(Linux)

looks good.

-- 
Lukáš Hejtmánek
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