[linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

[Andrew Morton]

Lee Revell <rlrevell at joe-job.com> wrote:
>
> Would this explain these?  When running JACK with settings that need
> sub-millisecond latencies, I get them when I generate any load at all on
> the system (typing, switching windows, etc).  I also get lots of these
> if I run JACK from an X terminal, but very few if I run it from a text
> console, even if X is running in the background.
> 
> Jul 13 14:36:16 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:199: Unexpected hw_pointer value [1] (stream = 0, delta: -25, max jitter = 32): wrong interrupt acknowledge?

I'm wondering what this message actually means.  "Unexpected hw_pointer
value"?

Does this actually indicate an underrun, or is the debug code screwy?