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
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