2014-2-26 上午10:35 於 "Sean McCully" sean_mccully@yahoo.com 寫道：
I have one of these sound cards that came with my motherboard,
/http://www.asrock.com/microsite/intelx79/GameBlaster.html/%5B1]
Two Channel Output from one audio Jack works perfectly, but there seems
to be a
problem with using the additional audio jacks for 6 channel "surround
sound".
http://www.alsa-project.org/db/?f=a8ae0aa3c0da4d697c1df5f403001dff50bb6e51
pasuspender -- speaker-test --channels=6 --device=surround51:0
speaker-test 1.0.27.2
Playback device is surround51:0 Stream parameters are 48000Hz, S16_LE, 6 channels Using 16 octaves of pink noise Channels count (6) not available for playbacks: Invalid argument Setting of hwparams failed: Invalid argument
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound?id...
when driver use ca0132_setup_stream instead of snd_hda_multi_out_analog_open , multi channel support is lost if ca0132_playback_pcm_prepare only use one dac
ca0132_setup_stream(codec, spec->dacs[0], stream_tag, 0, format);