[PD] Pd + jack GUI redraw (CCRMA FC4)

[Michael Berkowski]

Hi all,

It's taken me a bit to narrow this down, and I haven't seen much in the 
archive related to this specifically, but I wondered if someone could 
shed some light on this GUI weirdness.

While running Pd with Jack, the GUI redraw when using the mouse is 
highly erratic.  Typically, it will start out fine and I can move a 
slider or numberbox smoothly, but if I hold onto it for more than a few 
seconds, the redraw will start to pause and hang behind by increasing 
intervals.  Meanwhile, there aren't any audio dropouts or xruns, just 
the slow GUI.  No CPU spikes, either.

I have found that if I constantly run a metro and a flashing button, the 
problem goes away since the GUI is forced to redraw at least as often as 
the metro beats, but I'd like to avoid doing this.

I initially noticed this problem with the planetCCRMA pd and jack rpms 
(which are older versions, I think).  But I have since recompiled Pd, 
Jack, and tcl/tk from source and the problem persists.

I'm using:
2.6.16-1.2080.13.rdt.rhfc4.ccrmasmp (FC4
jackd -R -d alsa -dhw:0 -r44100 -p2048 -n2  (doesn't seem to matter what 
jack params are used, RT or not)
pd 0.39-2 compiled with alsa and jack support.

I'd be thankful if anyone has an ideas before I try upgrading the kernel 
as a last resort.

Best,
Michael Berkowski