Jackd Problems -- alsa_pcm: xrun of at least 1227061150613.504 msecs

[Jeremy]

Hello Jonathan,

To get jack running properly you need:
- Planet CCRMA packages 
(http://ccrma.stanford.edu/planetccrma/software/) which are not 
available for F9
- low latency kernel, Planet CCRMA also provides these, unfortunately 
not for F9
- zero latency soundcard, an onboard card probably never works without 
an xrun every now and then

An xrun is indeed a buffer under/overrun and could be caused by numerous 
things, always hard to put a finger on it. Could be software, hardware. 
Best is to run jack with a light weight WM like fluxbox or IceWM and to 
use as little other programs as possible. And to switch to another 
version of Fedora (like 7 or 8) for which there are Planet CCRMA 
packages available, otherwise it's no use I think.

Good luck!

Jeremy

Paulo Cavalcanti wrote:
> 
> 
> On Wed, Nov 19, 2008 at 1:28 AM, Jonathan Ryshpan <jonrysh at pacbell.net 
> <mailto:jonrysh at pacbell.net>> wrote:
> 
>     In the past I've never had any problems running jackd.  Now I'm getting
>     a very large number of messages reading:
>            **** alsa_pcm: xrun of at least 1227061150613.504 msecs
>     I'm running F9 on an x86_64 system with all updates installed.
>     Pulseaudio is not running.  Jackd is started via qjackctl.  No past
>     problems with audio beyond the usual conflicts between pulseaudio and
>     firefox.
> 
>     Questions:
>     (1) What exactly does this message mean?  An "xrun" is a buffer under-
>     or over-run -- but what does the time interval represent?
> 
>     (2) Whatever the time interval means, it looks rather large.
>     1227061150613.504 msec is many days (or maybe years if msec means
>     millisec and not microsec)  This looks like a misconfiguration of some
>     kind or a missing component.  Any idea what it might be?
> 
> 
> The solution depends on your card (I have an Intel onboard card).
> But this material may give you an idea on what you can try:
> 
>  http://people.atrpms.net/~pcavalcanti/alsa-1.0.15rc2_snd-hda-intel.html#jack
> 
> 
> -- 
> Paulo Roma Cavalcanti
> LCG - UFRJ
>