Working around I've found the following Thinkpads have this issue &
solution:
X200
X200s
X200t
X300
X301
T400
T500
W500
W700
W700ds
Though I cannont figure out anything about the "SL" line of Thinkpads.
@jango
You don't need to test it. I've verified it's the same problem & solution
as all the other thinkpads
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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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