Date: Sat, 13 Oct 2012 17:51:48 +0800 From: darcsis@gmail.com (Denise H. G.) To: "Ronald F. Guilmette" <rfg@tristatelogic.com> Cc: freebsd-hardware@freebsd.org Subject: Re: Audio out via HDMI... how? Message-ID: <86txty3djf.fsf@venux.xbsd.name> In-Reply-To: <32288.1349820665@tristatelogic.com> (Ronald F. Guilmette's message of "Tue, 09 Oct 2012 15:11:05 -0700") References: <32288.1349820665@tristatelogic.com>
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On 2012/10/10 at 06:11, "Ronald F. Guilmette" <rfg@tristatelogic.com> wrote: > > [[ I didn't get much in the way of traction on this question over in > freebsd-questions, so I am posting it again here, in the hopes that > I will have more luck here. ]] > > > I have a laptop which has an HDMI output port. > > I can get _video_ out of that (with xbmc) just fine. Audio, not so much. > Like not at all, as far as I can tell. > > So anyway, here is what I get when I do "cat /dev/sndstat": > > pcm0: <HDA Realtek ALC888 PCM #0 Analog> (play/rec) default > pcm1: <HDA Realtek ALC888 PCM #1 Analog> (rec) > pcm2: <HDA Intel Cantiga HDMI PCM #0 HDMI> (play) > > I have the HDMI output wired into my everything-capable Sony 5.1 channel > receiver, which then, in turn, is wired into my 4 (count 'em four) speakers. > > OK, so now, could somebody please just tell me how I can do a test > that will determine why I ain't gettin' no audio? (And by the way, > what I am *really* trying to do here is to run xbmc. But no audio > is coming out of that... at least not via the HDMI port... so I'm > stuck tying to dredge into this problem at a deeper level. Oddly, > when running xbmc on the laptop, there _is_ 2channel sound coming out > of the tinny little built-in speakers in the laptop.) > > So anyway... > > My intelligent HDMI-switching handles-everything receiver is capable > of decoding 5.1 DTS-HD, Dolby TrueHD, and eveything else too. The > receiver is working just fine.. not a thing wrong with it. It works > great with my Blu-Ray player and does the digital->analog decoding for > anything and everything I throw at it. > > Again, I just want to know: How does one go about TESTING audio output > via a laptop HDMI-out port? I tried these things (while the laptop's HDMI > port was wired to my receiver), but not a sound was heard: > > cat /dev/random > /dev/dsp > > cat /dev/random > /dev/dsp2 > > (Note that before I ever did this test I set hw.snd.default_unit=2.) > > The FreeBSD handbook page that deals with setiing up audio cards doesn't > provide a whole lot of guidance for how to test and/or fix digital audio > output, whether it is coming out via HDMI (as in my case) or via any other > kind of physical transport (e.g. coax or S/PDIF). > > Somwebody please pass me a clue. I'd really like to get this working. > Thanks. > > > Regards, > rfg > > > P.S. Even if I end up, in the end, downmixing all my audio to 2 channel, > in xbmc, before the audio even hits the HDMI cable, I could live with that. > Bu right now, as far as I can tell, I can't get _any_ kind of audio flowing > down that HDMI cable at all, period. I think you might take a look at those sysctl things. Just run: sysctl dev.hdaa to see what is comming out. Normally you can find in the output something like: dev.hdaa.X.nidY_config: ..... dev.hdaa.X.nidZ_config: ..... Some of which are labeled 'Speaker', some 'Headphones', and some 'Digital-out' which I guess is a HDMI output. The point is you have to associcate your 'Speaker' with 'HDMI' I think. That is to say, if your 'Speaker' has a configuration of 'as=1 seq=0', then your 'Digital-out' must have something like 'as=1 seq=15' or something. The numbers I just made up, you have to do them according to your machine output. This is just a FYI. Hope it would work for you.
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