The problem from https://bugs.freedesktop.org/show_bug.cgi?id=61182 is very nasty for r600g users. The last commit from https://bugs.kde.org/show_bug.cgi?id=315089 seems to fix the problem. Reproducible: Always
Thanks, fixed in CVS. + 22 Apr 2013; Michael Palimaka <kensington@gentoo.org> + +files/kwin-4.10.2-mesa.patch, +kwin-4.10.2-r1.ebuild: + Backport workaround from upstream to fix crashes with mesa-9.1/r600 and + >=linux-3.8.