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[Brian Gallimore <859836@xxxxxxxxxxxxxxxxxx>]

I believe I have the same symptoms.  I do not have the error in my Xorg
log as Tony did.

Additional information:
1- error message dialog box pops up at startup:  "could not apply the stored configuration for monitors.... none of the selected modes were compatible with the possible modes"
2- the font in my "home folder" is small/looks funny and all the graphics buttons are missing
3- running "displays" shows unknown display of the correct size of my two monitors together, pressing detect displays does nothing in X, but if started from a terminal:
(gnome-control-center:2898): GnomeDesktop-CRITICAL **: gnome_rr_mode_get_id: assertion `mode != NULL' failed
(gnome-control-center:2898): GnomeDesktop-CRITICAL **: gnome_rr_mode_get_width: assertion `mode != NULL' failed
(gnome-control-center:2898): GnomeDesktop-CRITICAL **: gnome_rr_mode_get_height: assertion `mode != NULL' failed
(gnome-control-center:2898): GnomeDesktop-CRITICAL **: gnome_rr_mode_get_freq: assertion `mode != NULL' failed
4- I was using Ubuntu 11.04 a week ago, didn't have this problem.  This problem started after I installed 11.10 and enabled twinview
5- 
:/var/log$ xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 3840 x 1200, current 3840 x 1200, maximum 3840 x 1200
default connected 3840x1200+0+0 0mm x 0mm
   3840x1200      50.0* 
6- Xorg.0.log file attached

can you offer help?

thanks,
Brian



** Attachment added: "brian-Xorg.0.log"
   https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/859836/+attachment/2548418/+files/brian-Xorg.0.log

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https://bugs.launchpad.net/bugs/859836

Title:
  Monitors are not identified in Oneiric with radeon driver

Status in “gnome-control-center” package in Ubuntu:
  Invalid

Bug description:
  If I run the "Monitors" control center app, it does not detect my dual monitors and lists just a single unknown monitor.
  With the proprietary fglrx driver, both the Benq and Samsung monitors are detected.
  Using Unity in Oneiric with all the latest updates applied.

  me@mypc:~$ gnome-control-center display

  (gnome-control-center:3298): GnomeDesktop-CRITICAL **:
  gnome_rr_mode_get_id: assertion `mode != NULL' failed

  (gnome-control-center:3298): GnomeDesktop-CRITICAL **:
  gnome_rr_mode_get_width: assertion `mode != NULL' failed

  (gnome-control-center:3298): GnomeDesktop-CRITICAL **:
  gnome_rr_mode_get_height: assertion `mode != NULL' failed

  (gnome-control-center:3298): GnomeDesktop-CRITICAL **:
  gnome_rr_mode_get_freq: assertion `mode != NULL' failed

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-control-center 1:3.1.92-0ubuntu6
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  Date: Tue Sep 27 03:27:41 2011
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100406.1)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: Upgraded to oneiric on 2011-09-20 (6 days ago)
  usr_lib_gnome-control-center:
   deja-dup           20.0-0ubuntu1
   gnome-bluetooth    3.1.92-0ubuntu1
   indicator-datetime 0.2.95-0ubuntu1

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