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[Thomas Hood <408903@xxxxxxxxxxxxxxxxxx>]

The microphone mute key yields Linux key input event KEY_MICMUTE which
has the value 248.  Add 8 to get the X KeyCode number, you get 256.
This is greater than the maximum KeyCode that X handles, 255.

See: http://www.x.org/wiki/XI2

The problem is similar to the problem with the Zoom hotkey combination
on the X220, Fn-Space.  The key combination yields KEY_ZOOM, value 372.
The corresponding X KeyCode, 380, is also above 255.

A workaround is to remap the keycodes to ones that X can handle.

See:
http://www.thinkwiki.org/wiki/Installing_Ubuntu_11.04_(Natty_Narwhal)_on_a_ThinkPad_X220#Fix_for_hotkey_shortcomings

(This page doesn't describe a way to control the LED on the Microphone
Mute key.)

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

Title:
  Does not handle microphone mute button (KEY_MICMUTE)

Status in “gnome-settings-daemon” package in Ubuntu:
  Triaged
Status in “udev” package in Ubuntu:
  Fix Released
Status in “xserver-xorg-input-evdev” package in Ubuntu:
  Triaged

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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