Well, the g-s-d seems get the key events correctly and begin "Launching
action for key type xx".

So we can assume all components before that are correct. I would take a
look at the media keys plugin and see how it perform the reset process.

Meanwhile, @Marc, could you do me a favor to test if any sound
applications could adjust the sound volume correctly after a
suspend/resume? If it cannot, then the error happens in audio subsystem
(alsa driver, pulse audio, etc.), or else in the IPC between media keys
plugin and the audio subsystem. Thanks!

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https://bugs.launchpad.net/bugs/881143

Title:
  [ThinkPad Edge E220s] Touchpoint/volume keys nonfunctional after
  suspend

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