Problema audio kubuntu e realtek ac97

[8solo5]

ciao raga
come da titolo ho una scheda audio intel integrata su toshiba a100-159, ho installato da circa una settimana kubuntu e dopo un po di perplessità iniziali sono riuscito a configurare tutto o quasi..

una volta installato il sistema operativo mi ha riconosciuto la scheda audio ma l'audio era pessimo e quindi ho deciso di installare i driver proprietari ma ora il pc è diventato muto...così ho riscaricato i driver della realtek e gli ho installati nuovamente con successo e ora l'audio c'è ma è veramente basso..quasi impercettibile ed è tutto al massimo..e in più da alsa-mixer non posso modificare il master che è inchiodato a zero..

qui il risultato del comando kmixer

Simple mixer control 'Master',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Front Left: Playback [on]
Front Right: Playback [on]
Simple mixer control 'PCM',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Front Left: Playback 180 [71%]
Front Right: Playback 180 [71%]
Simple mixer control 'Front Mic',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Line',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [on]
Simple mixer control 'CD',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Mic',0
Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Playback channels: Front Left - Front Right
Capture channels: Mono
Limits: Playback 0 - 23
Mono: Capture [off]
Front Left: Playback 15 [65%] [on]
Front Right: Playback 16 [70%] [on]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 13
Front Left: Capture 0 [0%] [on]
Front Right: Capture 0 [0%] [on]
Simple mixer control 'Mixer',0
Capabilities: cswitch cswitch-joined cswitch-exclusive
Capture exclusive group: 0
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Caller ID',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Off-hook',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]


cosa posso fare?