OpenGL composition broken after KDE 4.5 update using the Kubuntu backports
After upgrading to KDE 4.5 using the Kubuntu backports after a normal reboot (no crashes), Kwin composition was broken. If I activate and deactivate the composition I get this message in the notification icon:
The following desktop effects could not be activated:
Desktop Cube Animation
Sticky Windows, etc., etc, etc....
If I change the composition method to Xrender it works just fine. But if I return to OpenGL I get the message mentioned. If I disable the functionality verification and try OpenGL I get a completely black screen.
I have an Nvidia GeForce GTS 360M card using the official Nvidia drivers (256.35). Kubuntu 10.04 x64. No problems before this update, I haven't changed the Nvidia driver in a couple of months so this bug must have relationship with the KDE 4.5 update.
If you need more information just ask for logs (giving me the place to look for them :) please)
PD: One day before this behavior I worked with an external monitor. After using it everything appeer to be working ok. Im not sure if this can have any relation.