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

[Matthias-Christian Ott]

Setting acpi_osi=Linux also works on my Thinkpad x200. You can add it to
the blacklist and submit as an upstream patch.

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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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