2008/1/16, Takashi Iwai <tiwai@xxxxxxx>: > At Wed, 16 Jan 2008 18:20:20 +0100, > Christophe Osuna wrote: > > > > I am having a bad time trying to get an ALC882 [1] to work. I hope > > that you can help me. Currently I am using alsa-driver-1.0.14 but it > > would probably be the same with 1.0.15 since there has been no change > > in /pci/hda/. > > There have been tons of changes for HD-audio between these versions :) > You should have looked at alsa-driver*/alsa-kernel/pci/hda. > > Anyway, now it's much better to try the latest ALSA HG version than > 1.0.15. 1.0.15 is so old. If you are not familiar with HG, try the > daily snapshot tarball below: > > ftp://ftp.suse.com/pub/projects/alsa/snapshot/ > I have tried alsa-driver-hg20080117; it shows two additional mixer options (Mic Boost and Front Mic Boost) but in the end it's the same: I am unable to access the 3rd ADC. ~# cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 1.0.15. Compiled on Jan 18 2008 for kernel 2.6.23.14-soos (SMP). ~# cat /proc/asound/devices 0: [ 0] : control 6: [ 0- 2]: hardware dependent 16: [ 0- 0]: digital audio playback 17: [ 0- 1]: digital audio playback 24: [ 0- 0]: digital audio capture 25: [ 0- 1]: digital audio capture 26: [ 0- 2]: digital audio capture 33: : timer ~# cat /proc/asound/pcm 00-02: ALC882 Analog : ALC882 Analog : capture 2 00-01: ALC882 Digital : ALC882 Digital : playback 1 : capture 1 00-00: ALC882 Analog : ALC882 Analog : playback 1 : capture 2 ~# arecord -l **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC882 Analog [ALC882 Analog] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 card 0: Intel [HDA Intel], device 1: ALC882 Digital [ALC882 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 2: ALC882 Analog [ALC882 Analog] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 When I start two instances of arecord to pipe hw:0,0,0 and hw:0,2,0 to /dev/null, both stop because of I/O error. The ALC882 datasheet states that "3 stereo ADCs support 16/20-bit PCM format, two for microphone array, one for legacy mixer recording". This is the only place that suggests there could be a difference, but I do not understand this sentence as "only 2 ADC can be used at a time" (English is not my native language). The block diagram in the following page does not suggest such a limit either. Besides that I have read in the same datasheet that "rates in sub-multiples (1/n) of 48kHz are interleaving n frames containing no sample blocks" and so we can have 8 kHz by setting one sample block every six frames. Still, I can't set the device to 8 kHz. Here is a summary of my questions: 1) Why is the 3rd ADC missing from PCM (the mixer does show it)? 2) If that is a bug, where should I look first? (However, because of my very limited experience I am not very confident in fixing that myself) 3) Is it possible to use two ALC882 driven by the same HDA? 4) In that case, how will I be able to access the second ALC882 (hw:0,x,y)? 5) Still in that case, will I be able to use snd_pcm_link() for all devices? 6) Would you know any ALSA-supported card with three ADC? 7) Does HDA really support 8 kHz? 8) If it does, will ALSA support it? Thanks for your help. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
