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[Shuhao <shuhao@xxxxxxxxxxxx>]

As a side note, the thinkvantage button also stops working.

The way to solve this problem is to use bumblebee and only turn on the
intel card until you need the nvidia card.

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https://bugs.launchpad.net/bugs/1317443

Title:
  mute mic button stopped working after nvidia driver installation

Status in “nvidia-graphics-drivers” package in Ubuntu:
  Confirmed

Bug description:
  I took a fresh install of Ubuntu 14.04 on Lenovo Thinkpad T420 with Nvidia NVS
  Mute microphone button works fine. 
  Also muting in the sound settings switches the led indicator on the button on and off as expected.

  I installed nvidia driver 331 required by CUDA toolkit.
  Restart.
  System works fine except the microphone mute button. 
  However, muting the mic in the sound settings dialog switches the led indicator correctly again.
  It looks like only the button is not sending any event to the sound settings.

  Switching to nouveau driver solves the problem but CUDA will not work.

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