Alsa et CA0106 - Pas de micro

Bonjour à tous.

Lecteur regulier des journaux du site, je me pose aujourd'hui sur mon clavier car depuis quelque temps un problème auquel je ne trouve pas de réponse m'agace serieusement.

Je m'explique :
Je possede un carte son Sound blaster live 24! (chipset CA0106).
J'ai eu quelques petit souci au début pour pouvoir en faire sortir du son, mais après desactivation des sorties numériques, tout est rentré dans l'ordre.
Le problème qu'il me reste à regler est que le micro ne fonctionne pas. Lorsque je lance alsamixer, aucun controle du micro n'y apparait, ni d'ailleur le nom du chipset.

Voici ce qui s'affiche dans alsamixer:
Card: CA0106
Chip:
View: [Playback] Capture All
Item: IEC958 [Off]

Et voilà le resultat de amixer -c 0 :
Simple mixer control 'Line in',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 255
Front Left: Capture 207 [81%] [0.00dB]
Front Right: Capture 207 [81%] [0.00dB]
Simple mixer control 'Mic',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 255
Front Left: Capture 0 [0%] [-99999.99dB]
Front Right: Capture 0 [0%] [-99999.99dB]
Simple mixer control 'Phone',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 255
Front Left: Capture 207 [81%] [0.00dB]
Front Right: Capture 207 [81%] [0.00dB]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'IEC958 Center/LFE',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 0 [0%] [-99999.99dB]
Front Right: Playback 0 [0%] [-99999.99dB]
Simple mixer control 'IEC958 Front',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 0 [0%] [-99999.99dB]
Front Right: Playback 0 [0%] [-99999.99dB]
Simple mixer control 'IEC958 Rear',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 0 [0%] [-99999.99dB]
Front Right: Playback 0 [0%] [-99999.99dB]
Simple mixer control 'IEC958 Unknown',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 0 [0%] [-99999.99dB]
Front Right: Playback 0 [0%] [-99999.99dB]
Simple mixer control 'Aux',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 255
Front Left: Capture 207 [81%] [0.00dB]
Front Right: Capture 207 [81%] [0.00dB]
Simple mixer control 'Analog Center/LFE',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 225 [88%] [4.50dB] [on]
Front Right: Playback 225 [88%] [4.50dB] [on]
Simple mixer control 'Analog Front',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 215 [84%] [2.00dB] [on]
Front Right: Playback 215 [84%] [2.00dB] [on]
Simple mixer control 'Analog Rear',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 155 [61%] [-13.00dB] [on]
Front Right: Playback 155 [61%] [-13.00dB] [on]
Simple mixer control 'Analog Side',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 185 [73%] [-5.50dB] [on]
Front Right: Playback 185 [73%] [-5.50dB] [on]
Simple mixer control 'Analog Source',0
Capabilities: cenum
Items: 'Phone' 'Mic' 'Line in' 'Aux'
Item0: 'Line in'
Simple mixer control 'CAPTURE feedback',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 230 [90%] [5.75dB]
Front Right: Playback 230 [90%] [5.75dB]
Simple mixer control 'Digital Source',0
Capabilities: cenum
Items: 'IEC958 out' 'i2s mixer out' 'IEC958 in' 'i2s in' 'AC97 in' 'SRC out'
Item0: 'i2s in'
Simple mixer control 'Shared Mic/Line in',0
Capabilities: cenum
Items: 'Line in' 'Mic in'
Item0: 'Line in'

Quelqu'un connait-il une issue à ce problème?