Activating composite in xorg.conf, and shadow and transparances in kwin, using last fglrx ati driver the visualization is garbaged Reproducible: Always Steps to Reproduce:
Created attachment 68804 [details] The garbaged screen
fglrx problem, unless you can verify that this also happens with the xorg 'radeon' driver.
the radeon driver doesn't support my card. The vesa or fbdev drivers doesn't show any problems. Now I'm using Xorg 7.0.0 rc1, but nothing has evolved...
Take this to ATI if you can still reproduce w/ current x11-drivers/ati-drivers versions.