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Help: problem with X11 / XFree86-DRI ; who to blame?


My OS is an up-to-date version of Fedora 7 on a Intel based PC.

I use a particular academic/scientific video rendering software VMD
( http://www.ks.uiuc.edu/Research/vmd/ ).
This software uses GLX/Mesa heavily.

My day-to-day window manager is XFCE. When I use VMD, it immediately
freezes keyboard/mouse on my console as soon as any video rendering
activity occurs. The typical error message in /var/log/messages is:

    kernel: [drm:i915_wait_irq] *ERROR* i915_wait_irq: EBUSY --
               rec: 147447 emitted: 147473

However, when I switch to KDE window manager, all this does not occur.

Obviously I first blamed XFCE, but the developers there are convinced
that the Xorg and/or related X11-video drivers are to be blamed.

Eventually I solved the problem: I disabled XFree86-DRI in the file

Is there anybody who knows about this matter and can help me
understand what's going on?
I'd like to report this problem somewhere, but who is to be blamed?
  XFCE ? (they deny)
  Xorg ?
  Fedora ?
  XFree86-DRI ?


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