i am having the same problem you decribe when playing cretain games like super maryo chronicles, and tremulous etc.
found some bugs that describe the problem:
https://bugs.launchpad.net/ubuntu/+s....2/+bug/189958
https://bugs.launchpad.net/ubuntu/ha...ev/+bug/205480
it seems that starting the game/program with for example:
Code:
tremulous - export SDL_VIDEO_X11_DGAMOUSE=0
works around the problem..i'll be investigating this further and report back
EDIT
adding this to xorg conf seems to fix it altogether:
Code:
Section "Module"
SubSection "extmod"
Option "omit xfree86-dga" # don't initialise the DGA extension
EndSubSection
hope this helps.
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