Leaving the xorg.conf in place, commenting out the 'Driver' line, also allows driver fallback (nvidia to nouveau) to work correctly.
And the color depth is 24 (verified in Xorg.0.log), in both cases: whether nvidia is used, or if it falls back to nouveau. ** Attachment added: "Resulting Xorg.0.log when xorg.conf has Driver commented out" https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/522061/+attachment/1939225/+files/Xorg.0.log-no-Driver.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/522061 Title: Nvidia proprietary drivers fallback test failed -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs