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[Bug 732096] Microphone input hissing background

https://bugzilla.novell.com/show_bug.cgi?id=732096

https://bugzilla.novell.com/show_bug.cgi?id=732096#c8


--- Comment #8 from Takashi Iwai <tiwai@xxxxxxxx> 2012-01-27 14:34:16 UTC ---
OK, what about the hda-verb pin setup? If you pass 0x21 instead of 0x20, does
it make sound worse? The difference is the bias voltage.

0x21 means the vref-50 and it's usually a better choice for the mic input jack.
Meanwhile, for a line-in jack, 0x20 may suit better.

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