Comment 6 for bug 350766

Ok here we go:

Driver "radeonhd" is totally useless because:

1) crashes even faster than the other drivers, as soons as glxgears is running for 10-30secs
2) painfully slow (800fps)

interesting: driver crached plasma including crash report (never happened with other drivers)

Driver "radeon":

1) fast (1800fps)
2) glxgears + vlc + google earth runs totally fine when Desktopeffects are disabled

3) crashes with Kwin desktopeffects, screen freezes in this case with mouse pointer still moving

Driver "ati":

1) fast (1800fps)
2) glxgears + vlc + google earth runs totally fine when Desktopeffects are disabled

3) 3) crashes with Kwin desktopeffects: Screen freezes and backlicht goes off!? weird....

I did test "ati" and "radeon" driver with defaults (no options in xorg.conf) and with options "on" only one option at a time.
Options do improve performance a bit and reduce tearing effects a little but do not seem to affect the freeze issue.

Again: "ati" and "radeon" driver run fine when Kwin desktopeffects are turned off.