[alsa-devel] HDA: CLFE DAC on ALC889 (Acer Aspire 8930G)

Takashi Iwai tiwai at suse.de
Wed Dec 3 08:05:26 CET 2008

At Wed, 03 Dec 2008 01:59:14 +0100,
Hector Martin wrote:
> I've been trying to get ALSA working with this laptop. So far the 
> attached patch adds rear support to the existing 4930g model, and tries 
> to add CLFE support. However, I haven't been able to get CLFE to work. I 
> don't seem to get any audio through DACs/mixers other than the first two 
> (front and rear).
> I can assign the CLFE output (pin 0x16) to the front or rear DAC and 
> hear the front audio through the CLFE speakers. I can also force the 
> front DAC (0x02) or rear DAC (0x03) to use the CLFE stream and hear it 
> through the front or rear speakers, so the audio is getting to the 
> codec. But either DACs 0x04 and 0x05 aren't working, or their associated 
> mixers (0x0e and 0x0f) aren't passing through the audio, or the OUT pins 
> don't like selections above 1.

Did you change "Channel Mode" setting?

The only concern with your change is the possible incompatibility with
the existing 4930g model.  If the pin mapping is identical, then it's
fine to change the existing code.  If not, it'd be safer to create a
new model preset.



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