[LAU] MIDI latency in Ubuntu 8.04

When I use the kernels from Ubuntu 8.04, my MIDI latency becomes
horrible. I have an external keyboard that connects to the computer
and then proceeds to loop-back out to external synthesizers. By
horrible, I mean that there is quite clearly a delay from when I hit a
key on my keyboard to when sound comes out the synthesizer. If
someone knows a tool I could use to measure the latency, I'd be glad
too. Otherwise, I'd just guess it is somewhere around 100
milliseconds.

When I switch back to my prior kernel from Ubuntu 7.10, the latency
becomes great (but the X server and other things stop working, thanks
to the magic of Ubuntu). Here are the kernels I've tried out with
Ubuntu 8.10:

2.6.24-18-generic

    Bad latency

2.6.24-18-rt

    Bad latency

2.6.22-14-generic

    (This is the kernel from Ubuntu 7.10)
    Excellent latency

Has anyone else had this problem? Do you know if it is
kernel-related, library-related, or Ubuntu-related? It almost seems
kernel-related, but why?

-David
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Received on Sat Aug 23 08:15:01 2008