Re: snd-cmipci with Jack not working

[Takashi Iwai <tiwai@suse.de>]

At Thu, 30 Jan 2003 01:48:18 +0200,
Antti Boman wrote:
> 
> Thanks, Takashi! I'll get back to these Friday night, as I'm way too 
> busy before that. There are some things included below:
> 
> Takashi Iwai wrote:
> > at first, please check which chip model you are using and get the
> > register dump from /proc/asound/card0/cmipci.
> 
> I thought I sent the chip model to the mailing list, but that was 
> actually one of the off-list messages. The model seems to be "C-Media 
> PCI CMI8738-MC6 (model 55)", as the dump of /proc/asound/card0/cmipci 
> here tells:
 
ok, then the chip model is the same one as i have now.


> >>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 only effect it had was locking the whole machine when using 
> playback/capture only.

do you mean with LL-patch?  or with preempt patch?

> >>- 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.
> 
> Yes, and as you most probably know, it refers to alsa-lib/src/pcm/pcm.c
 
if the above function is directly called from jack, then it should be
a bug of jack.  the error above says the passed argument is a null
pointer.


> Oh, btw, I'm using alsa 0.9.0rc6, and as root (which you obviously 
> already gathered from me using lowlatency patches).
> 
> Kernel 2.4.19 with AMD Athlon.
> 
> >>- 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...
> 
> Here it does the same thing every time.

ah, sorry, what do you mean "kernel real-time patches"?
preempt-patch?

then i don't know.  i don't use them together with 2.4 kernels.


Takashi


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