I have this problem on my desktop - I can hear myself talking through
the mic but nothing records in Sound Recorder nor does the mic work for
Skype. Works when booted from LiveCD, doesn't work when booted from the
hard drive. The difference AFAICT is that somewhere along the line a new
sound driver was installed because when booted from the LiveCD I have
only a stereo card but when booted from the hard drive I have the full
5.1 controls. My guess is that the sound driver is at fault here. How
does on tell what driver is installed and possibly install a newer
version.

$ lspci -vv | grep Audio
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front 
Center - Woofer - Side Left - Side Right
  Limits: Playback 0 - 65536
  Mono:
  Front Left: Playback 19818 [30%] [on]
  Front Right: Playback 19818 [30%] [on]
  Rear Left: Playback 19818 [30%] [on]
  Rear Right: Playback 19818 [30%] [on]
  Front Center: Playback 19818 [30%] [on]
  Woofer: Playback 19818 [30%] [on]
  Side Left: Playback 19818 [30%] [on]
  Side Right: Playback 19818 [30%] [on]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right - Rear Left - Rear Right - Front 
Center - Woofer - Side Left - Side Right
  Limits: Capture 0 - 65536
  Front Left: Capture 65536 [100%] [on]
  Front Right: Capture 65536 [100%] [on]
  Rear Left: Capture 65536 [100%] [on]
  Rear Right: Capture 65536 [100%] [on]
  Front Center: Capture 65536 [100%] [on]
  Woofer: Capture 65536 [100%] [on]
  Side Left: Capture 65536 [100%] [on]
  Side Right: Capture 65536 [100%] [on]

Any ideas?

-- 
Sound capture (microphone) works on LiveCD, but don't work after installation
https://bugs.launchpad.net/bugs/460351
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