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

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From: Calvin Walton
Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work
Date: Tuesday, November 30, 2010 - 7:58 pm

On Tue, 2010-11-30 at 19:53 +0100, Lukas Hejtmanek 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.

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>

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Messages in current thread:
[Regression] 2.6.37-rc1: Lenovo T61 mute button does not work, Lukas Hejtmanek, (Tue Nov 30, 11:53 am)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Calvin Walton, (Tue Nov 30, 7:58 pm)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lukas Hejtmanek, (Wed Dec 1, 1:08 am)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lukas Hejtmanek, (Wed Dec 1, 3:54 pm)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lukas Hejtmanek, (Fri Dec 3, 7:13 am)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lin Ming, (Sun Dec 5, 6:37 pm)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lukas Hejtmanek, (Mon Dec 6, 2:31 am)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lin Ming, (Mon Dec 6, 2:42 am)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lin Ming, (Mon Dec 6, 8:19 pm)
Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does n ..., Lukas Hejtmanek, (Wed Dec 8, 5:34 am)