Originally Posted by gandalfn
I had also the same problems with last Xorg 1.11 and nvidia GeForce G105M card. This card seems do not supports trapezoid acceleration checked with "nvidia-settings -q AccelerateTrapezoids".
For impatient, like me, I made and attached a dirty and quick fix for Xorg 1.11 from AaronP explanation in http://lists.x.org/archives/xorg-dev...er/026050.html
which seem to fix the problem in wait a real and serious fix from xorg or nvidia guys.
WARNING ! this patch is not an official patch and do not pretend to fix the slowdown bug, it's only a quick and dirty hack
Uhm... just installed, but getting segfaults like this on every GL operation:
kwin_opengl_tes: segfault at fffffffffffffff8 ip 00007f9ff7b45b44 sp 00007fff903b3440 error 4 in libnvidia-glcore.so.285.05.09[7f9ff6916000+1867000]
kwin_opengl_tes: segfault at fffffffffffffff8 ip 00007f0c1ede7b44 sp 00007fff2155c8d0 error 4 in libnvidia-glcore.so.285.05.09[7f0c1dbb8000+1867000]
glxgears: segfault at 0 ip (null) sp 00007fffba3aff98 error 14 in glxgears[400000+5000]
glxgears: segfault at 0 ip (null) sp 00007fff51a78a48 error 14 in glxgears[400000+5000]