From: Calvin Walton <calvin.walton@gmail.com>
To: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work
Date: Tue, 30 Nov 2010 21:58:44 -0500 [thread overview]
Message-ID: <1291172324.14274.33.camel@nayuki> (raw)
In-Reply-To: <20101130185303.GI10354@ics.muni.cz>
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 <calvin.walton@gmail.com>
next prev parent reply other threads:[~2010-12-01 2:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-30 18:53 [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work Lukas Hejtmanek
2010-12-01 2:58 ` Calvin Walton [this message]
2010-12-01 8:08 ` Lukas Hejtmanek
2010-12-01 22:54 ` Lukas Hejtmanek
2010-12-03 14:13 ` Lukas Hejtmanek
2010-12-06 1:37 ` Lin Ming
2010-12-06 9:31 ` Lukas Hejtmanek
2010-12-06 9:42 ` Lin Ming
2010-12-07 3:19 ` Lin Ming
2010-12-08 12:34 ` Lukas Hejtmanek
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