(In reply to comment #5)
> To me this issue seems to appear randomly - sometimes KDE starts with
> working compositing, but most often it does not.

Same, here.
When it starts _with_ compositing, then error message appears.
_Without _ compositing glxinfo runs OK and GL performance is nearly 25% better!

Q3A goes from ~53 fps to 66 fps (640x480 window on 1920x1080 screen) with my
poor Duron 1800/RV730 AGP.

So is there a possibility, that we can disable compositing on the fly, when GL
apps starts?