[alsa-devel] Problems with ALC882
christophe.osuna at gmail.com
Mon Jan 21 12:27:18 CET 2008
Tobin, thanks for all the information you provided.
2008/1/18, Tobin Davis <tdavis at dsl-only.net>:
> Yes, it "should". But it also depends on the physical wiring of your system. If you have a system with only 3 audio jacks in the back, it is very difficult to have surround sound & 3 inputs at the same time.
I have plenty of jacks, including one "Mic", one "Front Mic" and one "Line In".
2008/1/18, Takashi Iwai <tiwai at suse.de>:
> Just deeper looking at the code, I found it's indeed buggy for the
> secondary ADCs. The patch below should fix it.
> The second and third ADCs are assigned to PCM#2 while the first ADC is
> to PCM#0. This is for avoiding the confusion of dsnoop and
> Give it a try and check whether it doesn't break, at least, for
> recording the first ADC. If it's OK, I'll apply it to the HG tree
Thanks for the patch. Applying it did seem to solve the problem; now I
can use the three ADC that are mapped to hw:0,0,0 hw:0,2,0 and
hw:0,2,1. I have successfully tested the following commands
arecord -f dat -D hw:0,0,0 | aplay -f dat -D hw:0,0,0
arecord -f dat -D hw:0,2,0 | aplay -f dat -D hw:0,0,0
arecord -f dat -D hw:0,2,1 | aplay -f dat -D hw:0,0,0
It wasn't necessary to override the "substream" value in
"alc880_pcm_analog_alt_capture" (I suppose that both analog_capture
and analog_alt_capture are used). Now I need to check that I can open
the three at the same time but I am rather confident on this.
Could you also tell me where I have to change code in order to force
the 8 kHz sampling rate? I will try to add an ugly change to
snd_hda_query_supported_pcm() but I am not sure on whether this is the
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