Am 11.10.2006 um 15:51 schrieb Jim Gettys:
On Wed, 2006-10-11 at 15:13 +0200, Bert Freudenberg wrote:
Hi,
I connected a headset (analog mic and phones) to an A-test board.
Sound output works fine after "alsaunmute". I have difficulties with
input, though.
I unmuted "Mic" in alsamixer, and tried arecord. Nothing is recorded.
"V_REFOUT" does make a difference, it connects in and out so I hear
what I'm saying directly (even more so if I enable "Mic boost").
However, in arecord I still get silence.
So - what do I need to do for mic recording? Does this have to do
with the analog input, do I have to switch that off?
Of course you have to switch it off; otherwise we'd have it on all the
time and have no control at all.
That's why I assumed it would be off by default.
The only documentation I could find is in a mailing list thread
(http://mailman.laptop.org/pipermail/devel/2006-July/000672.html):
*a- tell the EC to turn on MIC_AC (ie: bypass C35 and R25) [ OLPC
specific ]
*b- tell ALSA to disable VREFOUT and the high pass filter [ AD1888
specific ]
So how do I "tell the EC to turn off MIC_AC"?
Whether this is actually your problem, only you can tell.
Well, is it normal that enabling this loops the mic directly to the
phones?
- Bert -
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