Try disabling Xinerama in your configuration file. I had a similar problem and it turned out that Xinerama was causing the RANDR extension to be missing even though the Xorg logs reported that the extension was loaded.
I still have to figure out a way to have both Xinerama and RANDR working. I also added the following section to my xorg.conf file, but I doubt that it's needed: Section "Extensions" Option "Composite" "Enable" Option "RANDR" "Enable" EndSection -- RandR loaded, but missing https://bugs.launchpad.net/bugs/157319 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