[Alsa-devel] snd-cmipci with Jack not working

[Antti Boman]

Hi,

I and a few other people have tried to get snd-cmipci (8738 integrated into ASUS A7V266 motherboard) work with Jack Audio Connection Kit, but with no success. We tried solving this problem in jack's developer list, but as there was no success I though (and was adviced) it might be the ALSA driver problem.

The thread about the problem can be found at
http://sourceforge.net/mailarchive/forum.php?thread_id=1580464&forum_id=3040

I've gathered the key information here:

- The sound when playing back is totally garbled, the pitch is lower
than the original, and I get lots of clicking alongside. If I'm not
using jack but alsa output, everything (playing and recording) is ok.

- I have the lowlat patch installed in kernel, but using or not using it
doesn't seem to change anything.

- The irq for the "card" is 10, and doesn't seem to be shared. I also
have .asoundrc set up.

- Jack server->client operation works ok, but playing back and recording
cause the troubles.

- After watching /proc/asound/card0/pcm0p/sub0/status and
/proc/asound/card0/pcm0c/sub0/status, it seems that the wake-up does
not happen in time although using relatively large buffersizes, or:

- the playback and capture directions might be driven by different
clocks (i.e. they run at different speeds)

- Using jackd with playback/capture only, it produces the following
message:
jackd: pcm.c:5851: snd_pcm_mmap_commit: Assertion 'pcm' failed

- If using kernel real-time patches with playback/capture only, the
system locks up. This doesn't happen with both capture and playback
enabled.

More can be found in the thread.

Anyway, we ran into dead-end. I'm very willing to answer any questions you may have, test any configuration you're suggesting, or debug anything you want me to debug.

And no, I still don't know if it's a Jack or ALSA driver problem. What I've read, though, is that people with other drivers (or chipsets) haven't had these kind of problems, and there are at least two reports on the same problem with users of C-Media 8738 with jack.

Thanks for any help!

-Antti Boman



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