I am having the same issue on an Intel 945 Chipset (laptop), so it is not just an Nvidia issue.
Steps attempted and results; Enable Desktop-Effects with just one display enabled - WORKS (flawlessly) Enable Desktop-Effects with both displays enabled - FAILS Enable Desktop-Effects with both displays set to a resolution of 640x480 - FAILS Enable second display and disable primary display - FAILS (fails to configure - cannot get into X with these selection) As a secondary note - i cannot set my second display as primary no matter what. I also noticed that if i run GLXgears it runs properly on the primary display but if i drag it across to my second display the windows remains but the rendered portion goes black (FPS stay the same there is no dip or rise in FPS). If i then drag it back to the primary display the gears will be visible again. Regards Tom Anderson -- desktop-effects and dual-head are incompatible https://bugs.launchpad.net/bugs/148352 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs