Tim Gardner wrote:
This doesn't seem to make a lot of difference. The external microphone is marginally better, but still not really usable (recognizable but distorted). The Gnome ALSA mixer shows 3 capture sources plus digital and 3 mux's. Only the first capture source records anything. I verified that you must have an external mic plugged in just to make sure the built-in mic wasn't recording.
rtg
Matthew Ranostay wrote:
I think the problem is that I set the dmux to ADC1MUX instead of ADC0MUX, could you test this patch to confirm? Please let me know your results.
Thanks,
Matt Ranostay
diff -r 7cf5e23f804e pci/hda/patch_sigmatel.c --- a/pci/hda/patch_sigmatel.c Fri Oct 19 08:23:00 2007 +0200 +++ b/pci/hda/patch_sigmatel.c Fri Oct 19 13:47:35 2007 -0400 @@ -2777,7 +2777,7 @@ static int patch_stac927x(struct hda_cod case 0x10280209: /* STAC 9228 */ spec->dmic_nids = stac927x_dmic_nids; spec->num_dmics = STAC927X_NUM_DMICS;
spec->dmux_nid = 0x1c;
spec->dmux_nid = 0x1b;
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Ok it is true that there are 3 mux capture sources, but as of the moment we are only using one of them, ADC0MUX(which will be the first capture source control).
The reason that you can barely hear any sound recording from a DMIC is that there is no hardware db gain, the only way you can currently get measurable results is from software gain.
Hope that answers your questions.
Thanks,
Matt Ranostay