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[Daniël van Eeden <launchpad@xxxxxxxxx>]

I can reproduce it easily with Ubuntu 13.04 (raring) with kernel
3.8.0-29-generic.

To make clarify what happens:
There are 4 ways to get the current speaker mute status: 
1. The mute led on the physical mute button.
2. The /proc/acpi/ibm/volume file
3. The icon (I'm currently using gnome-shell)
4. The PulseAudio Volume Control

To mute/unmute there are 3 methods:
a. The hardware mute button for the speaker.
b. The slider for the volume icon in gnome-shell
c. PulseAudio Volume Control
 
If I use method a then all four statuses remain in sync. If I use method b or c to mute then 1 and 2 don't change.

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https://bugs.launchpad.net/bugs/788540

Title:
  [Thinkpad T410s] Mute indicator gets out of sync

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  The Thinkpad T410s has an indicator led on the mute button and one on
  the microphone mute button.

  If I only use the hardware mute key everything works fine, but when I
  use indicator-sound or pavucontrol the LED won't switch off and the
  indicator gets out of sync.

  Mute in /proc/acpi/ibm/volume follows the hardware key and also
  doesn't switch when I use pavucotrol or indicator-sound.

  Version: Ubuntu 2.6.38-9.43-generic 2.6.38.4

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