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Bug#443936: xserver-xorg-video-mga: windowmaker and 1.9.99 get along terribly



k l s [2007-09-25 14:35]:
> > I have pretty much no idea what to look at here. So I am CCing Tilman
> > (the upstream dev).
> > 
> > I didn't use WindowMaker recently so I don't have any idea what it looks
> > like these days. Do you have the same problem in you start an empty
> > session with something like "startx /usr/bin/xterm" ?
> 
> I've tried using openbox w/ an xterm and it has no problems.

Interesting! I'm clueless as to what's going on though. 
I'll try to look into it in the next days.

> > The problem could related to the acceleration architecture. You're using
> > the default right now (XAA). Does it help if you add:
> >     Option "NoAccel" "true"
> > to the Device section of your xorg.conf? It will disable XAA
> > acceleration completely.
> 
> NoAccel is slower than I recall accelerated having been in the past
> (as it ought). I think it starts faster than the standard XAA
> acceleration, but it gets slower as windows are repeatedly exposed.
> Some kind of resource starvation?
> 
> > Or maybe the new architecture EXA would be better (I don't know how good
> > it is in the mga driver so far). Does it help if you add
> >     Option "AccelMethod" "EXA"
> > instead of the above NoAccel line?
> 
> I think I remember having read that EXA isn't ready yet, but I tried
> it for the heck of it. It's tremendously slower.

At the moment, MGA's EXA implementation is only usable if you use
  Option "MigrationHeuristic" "greedy"

Regards,
Tilman

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