Created attachment 93166 [details]
kernel log

When I try to shutdown/restart/log out of KDE, the window with the countdown
opens and show up correctly, but the background is corrupted with random stuff
such as windows/menus that were opened before, or even currently opened windows
but totally reversed and/or at different places. 
Unfortunately, it doesn't look like I can take a screenshot while that screen
is open.
It works fine with the proprietary driver.

Card: Nvidia 8800 GT
I am using mesa-git (as of commit 80bf1fbaf6bb3d9b7a8543ea764c6d19887ac0b8).
xf86-video-nouveau 1.0.10-2
Arch Linux