Attached to this bug is an ebuild for the nvidia-driver version 177.78. It is a beta version of the nvidia driver but known to fix some problems regarding to composite extensions and KDE4~ series desktop. Reproducible: Always
Created attachment 167099 [details] nvidia-drivers-177.78.ebuild
*** Bug 239455 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 238969 ***