http://bugzilla.novell.com/show_bug.cgi?id=520975
User tiwai@novell.com added comment
http://bugzilla.novell.com/show_bug.cgi?id=520975#c22
--- Comment #22 from Takashi Iwai 2009-07-30 07:11:12 MDT ---
OK, then I must have done something wrong. Will check it later.
The "Mic Jack Mode" specifies whether you want to plug a microphone or a
line-in. The BIAS voltage is difference in these two cases, which influences
on the quality.
The fact that the internal mic doesn't work with dell-m4-2 is obvious. In this
model, the driver is informed to ignore the digital mic pin corresponding to
the internal mic. So, from the driver perspective, it's right behavior :)
Just misinformed.
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