https://bugs.freedesktop.org/show_bug.cgi?id=30007
--- Comment #13 from davide marsicanbear@gmail.com 2010-09-11 16:41:27 PDT --- I'm attaching it right now.. Marek - I tried to apply that patch by modifying the mesa-9999 ebuild, but patching failes..
(In reply to comment #11)
Can your run kwin with the environment variable RADEON_DEBUG=fp and post the stderr output.