On Wed, Oct 14, 2009 at 9:45 AM, Takashi Iwai <tiwai@xxxxxxx> wrote: > At Tue, 13 Oct 2009 21:52:02 -0600, > Robert Hancock wrote: >> >> On Tue, Oct 13, 2009 at 3:40 AM, <LoganLi@xxxxxxxxxxxxxx> wrote: >> >> >> > What is the problem, specifically? >> >> >> >> >> >> With the latest patch I do get the optical output lighting >> >> up and the >> >> >> receiver detects a PCM signal, but it seems to be just >> >> silence coming >> >> >> through. (In previous iterations the SPDIF digital converter wasn't >> >> >> being enabled automatically so it didn't get even that far.) >> >> > >> >> > You can fiddle with hda-verb to issue digital-converter verbs. >> >> > Possibly you need to flip the digital-enable bit to send >> >> the values... >> >> >> >> Well, I think I tried all combinations of the flags on the digital >> >> converter in hda_analyzer without any luck. I'm assuming it's >> >> something else (presumably codec-specific) that hda_analyzer doesn't >> >> know about.. >> >> >> > >> > Hi, Robert >> > We cannot duplicate bug of SPDIF Out cannot work on VT1828S board. >> > You said it's fine in Windows, right? >> >> Ahh, I see the problem. I think it's related to what we were talking >> about with the second SPDIF output: If I play back on subdevice 1 I >> don't get any output. But if I force playing on substream 1 instead of >> the default 0 (i.e. hw:0,1,1) then I get audio. I'm assuming that >> substream 0 is the codec's HDMI output (which actually doesn't exist >> on this motherboard). >> >> It appears whether or not the "iec958" alias that PulseAudio uses when >> selecting "Output Digital Stereo" profile actually ends up using >> substream 1 instead of 0 is based on luck. as it sometimes works and >> sometimes doesn't. Having different substreams go different places is >> pretty non-intuitive and it seems software doesn't expect this >> behavior. I think that the SPDIF and HDMI outputs really should be >> separate subdevices (i.e. hw:0,1 and hw:0,2 or something) instead, >> unless something makes this impossible. If the aliases for iec958 and >> hdmi were set up to point to the correct subdevice then everything >> would work as it should.. > > Yes, it's possible to assign two different devices if the pin-config > of each digital output is set up properly for SPDIF and HDMI. > It won't be too difficult to fix, but I have little time now. Actually, I just checked the version of patch_via.c that's in the sound git tree and it doesn't seem to have this problem with SPDIF output. (I believe the version I was using had one of the second-SPDIF patches that was dropped.) There are still 2 substreams it appears, but both seem to output to SPDIF.. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
