[linux-audio-user] Fullduplex on PPC hardware
Marijn P. Vriens
mpv at tecnocimiento.cl
Wed Oct 13 13:59:04 EDT 2004
I need to use the soundcard of a Apple IMac and IBook in Fullduplex audio
mode. I installed kernel 2.6.8 and i am using snd-powermac as the audio
I have been trying with ohphone to see if fullduplex works. Unfortunately it
keeps saying: "Could not open sound device - Check permissions or full duplex
capability." (even when running as root).
Now, Apple being Apple, and this being post 2000 hardware, I do not think that
the hardware is only half duplex (but i have no conformation one way or the
other). It makes more sense that it's the driver.
So my question is: Does anybody know the status of full-duplex support of
PowerPC hardware under linux? Do I need to give some special options when
inserting the module or patch the kernel? I read somewhere that you need to
enable 2 DMA channels for full-duplex support, does this have anything to do
with this problem?
Director Tecnológico Tecnocimiento.
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