I am using Ubuntu Hardy with the kernel 2.6.24-23-rt and jackd 0.116.1 and I'm not having xruns or midi timing problems.

With my laptop internal sound card (Intel) I can get a 8ms latency without xruns. With an external USB card I launch JACK with the following options:

/usr/bin/jackd -v -R -P70 -dalsa -r44100 -p256 -n3 -D -Chw:1,0 -Phw:1,0 -m -i2 -o2 -Xseq


I've tried the kernel 2.6.27-3-rt, but it doesn't work with dual core machines: http://ubuntustudio.org/8-10_release_note

Marco

2009/1/25 <b.ohnsorg@freenet.de>
> The way to get rid of xrun's on Ubuntu Hardy is to install the 2.6.27
> kernel from
>
> https://launchpad.net/~kernel-ppa/ archive
>
> (a backport of the Intrepid kernel to Hardy; or you can install the
> Intrepid kernel directly)
>
The only thing I want to emphasize: Don't use the 2.6.27 rt-kernel, it's
midi timing is absolutely broken and unusable.

[1]
http://ubuntuforums.org/showthread.php?p=6138750&mode=threaded#post6138750
[2] https://bugs.launchpad.net/ubuntu/+source/linux-rt/+bug/296195
[3] http://ubuntuforums.org/showthread.php?t=995204
[4] https://bugs.launchpad.net/ubuntu/+source/linux-rt/+bug/300806
[5] http://www.nabble.com/kernel-and-midi-seq-td21243960.html



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