[PATCH 0/5] [Karmic] Fix Mute button functionality on Lenovo Thinkpads

Amit Kucheria amit.kucheria at canonical.com
Tue Sep 1 08:32:55 UTC 2009

On 09 Aug 29, Jerone Young wrote:
> Impact: All recently Lenovo Thinkpads since the T61/X61/R61 have an
> issue under Linux where the Mute key will act independent of the OS at a
> hardware level. The problem though is the user never sees an OSD and
> they also don't realize they are muted as their is no indicator. Also on
> some Lenovo Thinkpads the mute will only work for the speakers and not
> the headphones. 
> LP# 281732
> Lenovo put logic in the bios of all Thinkpads to query, if the OS is
> "Linux", the bios will change the functionality of the mute key to be a
> mute key press.
> It is rather unfortunate Lenovo still doing this today. Though these
> platforms are highly unlikely to get a bios update to better handle how
> the mute hot key should work under Linux. Fortunately the mute key is
> the only area that is affected.
> Fix: The following patches are fixes by exposing the OS as Linux to
> recently released Thinkpads so that the mute key will act as a mute key
> press.
> Testcase: When press mute key you will see on screen display indicating
> that the mute key has been pressed and the sound is muted. 

Nevermind the bug-related comment in the other thread. Your 0/n email got
separated from the rest.

Amit Kucheria, Kernel Engineer || amit.kucheria at canonical.com

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