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[Daniël van Eeden <launchpad@xxxxxxxxx>]

With kernel 3.0.0-14-generic on oneiric with a T410s this is the output
from xev when I press the micmute button. There is no event when I
release the key. Pressing the micmute button emits a KeyPress and a
KeyRelease event.

KeyPress event, serial 35, synthetic NO, window 0x4600001,
    root 0xc1, subw 0x0, time 93097135, (103,-18), root:(1544,10),
    state 0x0, keycode 248 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 35, synthetic NO, window 0x4600001,
    root 0xc1, subw 0x0, time 93097135, (103,-18), root:(1544,10),
    state 0x0, keycode 248 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

As far as I known there is still no micmute shortcut defined in gnome3.

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

Title:
  Thinkpad T400s, T410s, T410, T510 & W510 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 “udev” package in Ubuntu:
  Fix Released

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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