On 6/3/08, Erik Slagter <erik@xxxxxxxxxxxx> wrote: > Hi there, > > Today I bought this sound device, I was hoping it had the C-Media CM650? > USB chip which is already supported by alsa (according to the list). > > Instead it has a CM6207 inside. > > The good news is that it supports USB audio "class" and it's more or less > usable, some mixer outputs are available (although they're all called > "speaker") and with some trickery the various outputs can be used. > > The other good news is that Sweex supplies the "official" datasheet from > C-media which I think is quite interesting and may very well be useful to > resolve the last few issues. Write this up for the Free Linux Driver project. http://lwn.net/Articles/276973/ http://www.linuxdriverproject.org/twiki/bin/view/Main/DriversNeeded > > These are the actual issues (so far, I didn't yet test it exhaustively): > > - using 2 channel output the sound is garbled; it looks like the "wrong" 2 > channel alt setting is used (output of /proc/asound/card?/stream0 on > request), 4/6 channel output is OK though. > - some high squeeking noise although C-Media claims the IC to be high-end > (or maybe their definition of high-end differs from mine ;-)) > - all outputs are labelled "speaker 1" > - only two outputs have a mute knob, the others cannot be silenced in any > way, only turned down > - one of the two outputs with the mute knob doesn't appear to do anything > (or maybe it's the sp/dif output?) > - the other (with mute) controls the front output > - the others (without mute) don't seem to do anything at all > > Is this a typical case of (a) bug(s) in the usb audio class driver or > should I think of "vendor extensions" here? > > Would any of the developers have some interest in the datasheet of the chip > and or any data of this thing? Of course I'd like it very much if the device > would be fully supported but I can only ask nicely ;-) > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@xxxxxxxxxxxxxxxx > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel > > > -- Jon Smirl jonsmirl@xxxxxxxxx _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel