Re: snd-cmipci with Jack not working

[Takashi Iwai <tiwai@suse.de>]

Hi,

At Wed, 29 Jan 2003 11:27:38 +0200,
Antti Boman wrote:
> 
> 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
 
at first, please check which chip model you are using and get the
register dump from /proc/asound/card0/cmipci.

> 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.
 
most likely the kernel scheduler is irrelevant.

> - 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)

hmm, it's difficult to know, but i don't think so.
could be an interrupt-related issue.

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

> - If using kernel real-time patches with playback/capture only, the
>   system locks up. This doesn't happen with both capture and playback
>   enabled.
 
i can't produce this on my machine...


anyway, i updated the driver a bit.
please update the cvs version and report whether it works or not.


ciao,

Takashi


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