[Bug 408903] Re: Thinkpad T400s, T410s, T410, & T510 microphone mute button does not work

[Thomas Hood]

The microphone mute key is not currently supported in Ubuntu but the fix
is fairly straightforward.

First, udev needs to map the micmute key's scancode to a keyname which
corresponds to an X key event.  This has been fixed[0] in udev upstream.
It is possible to make the same change locally, as described here[1].

Second, the key event needs to mute the microphone.  This can be
accomplished with a small script as described here[1].

[0]http://git.kernel.org/?p=linux/hotplug/udev.git;a=commitdiff;h=6e3b1694a4dea049591af1f089adce327bf6a542
[1]http://www.thinkwiki.org/wiki/Installing_Ubuntu_11.04_(Natty_Narwhal)_on_a_ThinkPad_X220#Fix_for_hotkey_shortcomings

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https://bugs.launchpad.net/bugs/408903

Title:
  Thinkpad T400s, T410s, T410, & T510 microphone mute button does not
  work

Status in “acpi-support” package in Ubuntu:
  Invalid
Status in “gnome-control-center” package in Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 9.04

  Pressing the new microphone mute button does not do anything.  It
  should toggle the mute on the current capture device and toggle an led
  that is part of the button.

  acpi_listen output:

  ibm/hotkey HKEY 00000080 0000101b

  
  xev output:

  MappingNotify event, serial 34, synthetic NO, window 0x0,
      request MappingKeyboard, first_keycode 8, count 248  

  MappingNotify event, serial 34, synthetic NO, window 0x0,
      request MappingKeyboard, first_keycode 8, count 247

  KeyPress event, serial 34, synthetic NO, window 0x3400001,
      root 0x118, subw 0x0, time 10334714, (317,-162), root:(322,207),
      state 0x0, keycode 248 (keysym 0x0, NoSymbol), same_screen YES,
      XLookupString gives 0 bytes:
      XmbLookupString gives 0 bytes:
      XFilterEvent returns: False

  KeyRelease event, serial 34, synthetic NO, window 0x3400001,
      root 0x118, subw 0x0, time 10334714, (317,-162), root:(322,207),
      state 0x0, keycode 248 (keysym 0x0, NoSymbol), same_screen YES,
      XLookupString gives 0 bytes:
      XFilterEvent returns: False

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