[Bug 281732] Re: Mute button not properly working on current Lenovo Thinkpads x200/x200s , t400/t500, X300/X301, & W series

[Steve Langasek]

The "fix" has been reverted because it worked by having Linux tell ACPI
that it's not a Windows-compatible OS.  That can have any number of side
effects, and kernel upstream considers it a serious bug to do this.

Upstream work is in progress to expose the BIOS mixer as an ALSA mixer
so that we will have OSD notification for this without having to break
ACPI handling.  Unfortunately this won't be ready for karmic, so 9.10
will have the same behavior as 9.04; but I expect we'll have a solution
available in time for lucid.

The mute button not being a toggle is probably not going to be fixed
unless the vendor decides to change their BIOS implementation.

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Mute button not properly working on  current Lenovo Thinkpads x200/x200s , t400/t500, X300/X301, & W series
https://bugs.launchpad.net/bugs/281732
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