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

Tim Gardner tim.gardner at canonical.com
Mon Aug 31 03:20:54 UTC 2009

Jerone Young wrote:
> Yes. Henrique is actually on the kernel bug I linked from LP bug:
> http://bugzilla.kernel.org/show_bug.cgi?id=13934
> On Sun, 2009-08-30 at 18:13 -0600, Tim Gardner wrote:
>> 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. 
>> Have you corresponded with the Thinkpad ACPI folks about these changes?

applied pending upstream comments.

Tim Gardner tim.gardner at canonical.com

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