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

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Date:	Mon, 06 Dec 2010 09:37:04 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	"Moore, Robert" <robert.moore@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	Calvin Walton <calvin.walton@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work

On Fri, 2010-12-03 at 22:13 +0800, Lukas Hejtmanek wrote:
> 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.

I'm looking at this regression.

Thanks,
Lin Ming


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