Public bug reported:
Description: Ubuntu 8.04
Release: 8.04
uname: 2.6.24-16-rt #1 SMP PREEMPT RT Thu Apr 10 15:15:40 UTC 2008 i686
GNU/Linux
Package versions:
jackd:
Installed: 0.109.2-1ubuntu1
Candidate: 0.109.2-1ubuntu1
Version table:
*** 0.109.2-1ubuntu1 0
500 http://au.archive.ubuntu.com hardy/universe Packages
100 /var/lib/dpkg/status
compiz:
Installed: 1:0.7.4-0ubuntu6
Candidate: 1:0.7.4-0ubuntu6
Version table:
*** 1:0.7.4-0ubuntu6 0
500 http://au.archive.ubuntu.com hardy/main Packages
100 /var/lib/dpkg/status
With compiz enabled, jackd reports excessive XRUNs, even with the
realtime kernel.
Disabling compiz in favour of metacity improves performance but not
latency. Naturally, as compiz is a significant 'wow-factor' drawcard of
Ubuntu (that actually has useful features, rather than just eye-candy),
it's an irritating problem. After all, OS X manages a 3D-accelerated
desktop AND a low-latency audio server!
Latency in general in Hardy seem to be higher than Gutsy - I was able to
run my Behringer UCA202 at 11.6ms rather than the current 69.7ms (which
still XRUNs like crazy, making it virtually impossible to demonstrate to
clients in a live context)
Specs on the UCA202 are available here:
http://www.behringer.com/UCA202/index.cfm?lang=ENG - it's been supported
by ALSA for quite some time...
** Affects: compiz (Ubuntu)
Importance: Undecided
Status: New
** Affects: jack-audio-connection-kit (Ubuntu)
Importance: Undecided
Status: New
** Also affects: compiz (Ubuntu)
Importance: Undecided
Status: New
--
Compiz does not play well with jack
https://bugs.launchpad.net/bugs/226872
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