I think I found where the problem started:

I tried different Kernels on my 14.04 devel. branch.
Check with acpi_listen if signal gets catched. This is the result:

kernel version           |   acpi_listen can see mic mute 
------------------------------------------------------
3.11.0                       |   yes
3.11.9                       |   yes
3.11.10.4                    |   yes
3.11.10.6                    |   yes
3.12.0-031200rc1    |   no
3.12.0-031200rc2    |   no
3.12.0-031200rc4    |   no
3.12.0                       |   no

So I guess the problem occured first at 3.12.0 rc 1

But the thing is that even if I get the signal (till 3.11.10.6) Ubuntu
does not react to this... Is this another issue?

** Changed in: linux (Ubuntu)
       Status: Incomplete => In Progress

** Changed in: linux (Ubuntu)
       Status: In Progress => Confirmed

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https://bugs.launchpad.net/bugs/1268880

Title:
  unable to toggle microphone mute on T410 / unable to unload
  thinkpad_acpi module

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