[ALSA] add STAC9708 output bias mixer control
AC97 Codec
This adds a mixer control for an undocumented bit of the STAC9708
that somehow affects the analog output. This should help reducing
the distortion at high output levels on ymfpci and SBLive cards.
Signed-off-by:
Clemens Ladisch <clemens@ladisch.de>
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