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[Maarten Terpstra <750259@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Binary package hint: xorg

Dual screen over VGA is no longer working for me under Natty. It used to
work fine under maverick, but since the upgrade it just shows
corruption/flickering screen. Whenever I'm using one screen it is
working fine, and when I plug in my second screen my main (internal
laptop) screen turns itself off and the external monitor keeps
flickering at high frequency, showing random colours and sometimes
little pieces of background. It doesn't matter whether the monitor is
plugged in at boot or not. I have reasons to believe that the intel
driver or xorg causes the problems because the GRUB and the login screen
work both fine on both screens at the same time. As soon as I'm logged
in this behaviour shows. It also doesn't matter if I'm using classic
GNOME or the Unity interface.  Xorg.0.log and dmesg are not showing any
errors.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6+4ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
Architecture: amd64
Date: Mon Apr  4 15:00:46 2011
DistroCodename: natty
DistroVariant: ubuntu
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug corruption natty ubuntu

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https://bugs.launchpad.net/bugs/750259

Title:
  Dual screen not working/shows corruption