Comment 16 for bug 497546

Here's the relevant bit from that apport blob.

Card0.Amixer.values:
 Simple mixer control 'Master',0
   Capabilities: pvolume pswitch
   Playback channels: Front Left - Front Right
   Limits: Playback 0 - 74
   Mono:
   Front Left: Playback 60 [81%] [-14.00dB] [on]
   Front Right: Playback 60 [81%] [-14.00dB] [on]
 Simple mixer control 'PCM',0
   Capabilities: pvolume
   Playback channels: Front Left - Front Right
   Limits: Playback 0 - 255
   Mono:
   Front Left: Playback 255 [100%] [0.00dB]
   Front Right: Playback 255 [100%] [0.00dB]
 Simple mixer control 'Mic',0
   Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
   Capture exclusive group: 0
   Capture channels: Front Left - Front Right
   Limits: Capture 0 - 80
   Front Left: Capture 0 [0%] [-74.00dB] [on]
   Front Right: Capture 0 [0%] [-74.00dB] [on]
 Simple mixer control 'Mic 1',0
   Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
   Capture exclusive group: 0
   Capture channels: Front Left - Front Right
   Limits: Capture 0 - 80
   Front Left: Capture 6 [8%] [-68.00dB] [off]
   Front Right: Capture 6 [8%] [-68.00dB] [off]