I have the problem under Ubuntu 7.10 with an Intel ICH7 sound controller.
I see a "master" entry in amixer, so the issue is not about the "front" input used instead of "master" :
$ amixer
Simple mixer control 'Master',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 30
Mono:
Front Left: Playback 30 [100%] [-1.50dB] [on]
Front Right: Playback 30 [100%] [-1.50dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB] [on]
Front Right: Playback 255 [100%] [0.00dB] [on]
Simple mixer control 'Line-In',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Mic Bypass',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 30
Front Left: Capture 0 [0%] [-34.50dB] [off]
Front Right: Capture 0 [0%] [-34.50dB] [off]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 14
Front Left: Capture 0 [0%] [0.00dB] [off]
Front Right: Capture 0 [0%] [0.00dB] [off]
Simple mixer control 'ExtMic',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [on]
I have tried building the alsa drivers from source (1.0.15-rc3) but it didn't help.
The issue has been there for a few weeks now, can't really remember exactly when it started though but it definitely started under Ubuntu 7.10
To me, this is not a duplicate of bug #45345
I have the problem under Ubuntu 7.10 with an Intel ICH7 sound controller.
I see a "master" entry in amixer, so the issue is not about the "front" input used instead of "master" :
$ amixer
Simple mixer control 'Master',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 30
Mono:
Front Left: Playback 30 [100%] [-1.50dB] [on]
Front Right: Playback 30 [100%] [-1.50dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB] [on]
Front Right: Playback 255 [100%] [0.00dB] [on]
Simple mixer control 'Line-In',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Mic Bypass',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 30
Front Left: Capture 0 [0%] [-34.50dB] [off]
Front Right: Capture 0 [0%] [-34.50dB] [off]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 14
Front Left: Capture 0 [0%] [0.00dB] [off]
Front Right: Capture 0 [0%] [0.00dB] [off]
Simple mixer control 'ExtMic',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [on]
I have tried building the alsa drivers from source (1.0.15-rc3) but it didn't help.
The issue has been there for a few weeks now, can't really remember exactly when it started though but it definitely started under Ubuntu 7.10