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[hingamp <157319@xxxxxxxxxxxxxxxxxx>]

I'm also affected, not so much the issue of annoying error messages each time an X app is launched but rather that some apps just don't start, e.g.
$ gnome-system-monitor
Xlib:  extension "RANDR" missing on display ":0.0".

I need Xinerama because of dual head display with one screen rotated

I'm using Lucid
Linux mendel 2.6.32-37-generic #81-Ubuntu SMP Fri Dec 2 20:32:42 UTC 2011 x86_64 GNU/Linux
HW NVIDIA Corporation Quadro FX 580
SW NVIDIA prop driver version current

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https://bugs.launchpad.net/bugs/157319

Title:
  Xlib: extension "RANDR" missing on display ":0.0" while using -nvidia
  with Xinerama turned on

Status in GTK+ GUI Toolkit:
  Fix Released
Status in “gtk+2.0” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: xorg

  Interesting problem.

  Whenever I start up X, it loads RandR, so far as I can tell (The xorg
  log shows that it is indeed loaded), but If I ever try to do anything
  via xrandr, it tells me that the extension is missing on my display.

  m3r1k@reborn-desktop:~$ cat /var/log/Xorg.0.log |grep RandR
  (==) RandR enabled
  (==) RandR enabled

  m3r1k@reborn-desktop:~$ xrandr -q
  Xlib:  extension "RANDR" missing on display ":0.0".
  RandR extension missing

  I'm not sure what to do.

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