I am also experiencing this behavior on my Thinkpad T410 running Kubuntu
11.04. The hardware and software indicators can get reversed either by
toggling the mute on the panel icon or if the hardware mute is enabled
on boot or resume from suspend. Pressing the mute button switches both
indicators, keeping them reversed. Changing the volume via the hardware
buttons will reset the hardware mute indicator and get them back in
sync.

I rebooted into the stock Windows 7 install to check its behavior. It
functions in a much more logical way: the software and hardware mute
indicators are kept in sync at all times.

While it is true that it is desirable at times to disable the speakers
while leaving the headphones operable, IMHO the current behavior is not
the correct way to expose this functionality to the user.

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https://bugs.launchpad.net/bugs/788540

Title:
  [Thinkpad T410s] Mute indicator gets out of sync

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