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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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