GNOME Bugzilla – Bug 645856
Xlib: extension "RANDR" missing on display ":?.0"
Last modified: 2011-04-09 01:38:28 UTC
gtk+ is only doings a compile time check for the availability of the XRANDR extension. If one e.g. uses Xvfb (for testing), one gets dozen of the above messages. Analysis of the situation and patches for other X apps can be found here: https://bugs.freedesktop.org/show_bug.cgi?id=30806#c5
Fixed a while back. http://git.gnome.org/browse/gtk+/commit/?id=d211c8af6bab2f99aeebb83707d29649f0108364