Hi Jonathan, first of all, thank you for your explanations! Jonathan Woithe wrote: [...] > The "pcm" control in alsamixer is not necessarily the same as the "pcm" > interfaces I've been talking about. Sorry for any confusion I've caused - I > forgot about the alsamixer control labelled "pcm". By pcm interface I'm > referring to the "hw:0"/"hw:1"/"default"/"spdif"/etc designators one can use > when specifying the output device for things like aplay. Good to know :-). That's what I did last the latter. But now I know what you meant by pcm. > >> Now, I tested with aplay. >> >> andreas@notebook1:~> aplay -l >> **** List of PLAYBACK Hardware Devices **** >> card 0: Intel [HDA Intel], device 0: ALC260 Analog [ALC260 Analog] >> Subdevices: 1/1 >> Subdevice #0: subdevice #0 >> card 0: Intel [HDA Intel], device 1: ALC260 Digital [ALC260 Digital] >> Subdevices: 1/1 >> Subdevice #0: subdevice #0 > > This is interesting. Those on the list more knowledgeable than I might > be able to correct me here, but I would interpret this to mean that > "device 0" (ie: hw:0) is your analog output while device 1 (ie: hw:1) > sends direct to the SPDIF channel on the ALC260. > >> If I'm using aplay -D default, the output is analog. If I'm using -D >> iec958 or spdif, there isn't any output. Btw.: using -D spdif or iec958 >> switches on the spdif switch in the mixer. > > Right, so my interpretation of that is that in terms of the software, > the "-D spdif" is probably doing the right thing in that the data is being > sent to the SPDIF portion of the chip. The fact that no SPDIF bitstream > appears probably has something to do with external switching employed > by your laptop which ALSA currently doesn't know about. > > How are you testing for the existance of an SPDIF bitstream by the way? Three ways: 1. Digital multimeter AC 200 mV - it always shows 0,0 V when the S/PDIF-device is used. I'm expecting a nearly constant output. 2. external high end DA converter, which receives nothing. 3. an own small microprocessor, which is a gateway between coax and optical output (in both directions) among other things. [...] > I didn't get a chance to look into this in greater detail over the weekend. > However, given the extra information now provided I'll see about doing up > a small test patch to test the GPIO theory. If that turns out to work > we can look into doing a permanent fix. I would be very glad to test this patch! If you need more information, please ask - I will try to provide them! Thank you very much for your help, kind regards, Andreas Hartmann ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
