Fix Master Mono problem on VIA KT600 integrated AC97 sound chip with snd_via82xx module

Сегодня по невыясненным причинам неожиданно пропало управление каналом Master Mono в микшере, звук был, но очень тихий. Попытки реинициализации не помогли, проблема оказалась в каком-то баге, при котором сбрасываются значения микшера VIA DXS:

user@callisto:~$ amixer | tail -28
Simple mixer control 'VIA DXS',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [-99999.99dB]
Front Right: Playback 31 [100%] [-99999.99dB]
Simple mixer control 'VIA DXS',1
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [-99999.99dB]
Front Right: Playback 31 [100%] [-99999.99dB]
Simple mixer control 'VIA DXS',2
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [-99999.99dB]
Front Right: Playback 31 [100%] [-99999.99dB]
Simple mixer control 'VIA DXS',3
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [-99999.99dB]
Front Right: Playback 31 [100%] [-99999.99dB]

user@callisto:~$ for ((n=0; n<=3; n++)); do eval amixer sset "VIA\ DXS",$n 0dB; done
Simple mixer control 'VIA DXS',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB]
Front Right: Playback 31 [100%] [0.00dB]
Simple mixer control 'VIA DXS',1
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB]
Front Right: Playback 31 [100%] [0.00dB]
Simple mixer control 'VIA DXS',2
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB]
Front Right: Playback 31 [100%] [0.00dB]
Simple mixer control 'VIA DXS',3
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB]
Front Right: Playback 31 [100%] [0.00dB]