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[Launchpad Bug Tracker <1372031@xxxxxxxxxxxxxxxxxx>]

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I use a Thinkpad R500 (2731-A11) with an external screen attached to the docking station. In about 1 out of 5 cases I get graphic disruption on the internal screen when I change the screen resolution (using arandr) for the external screen to the native resolution 1920x1200. It looks like this: https://www.youtube.com/watch?v=JwPGBCJqqvE&feature=youtu.be
Note that the external screen is not affected by this. Sometimes this also occurs when I boot the system just before the graphical login manager should appear.
I also noticed that it is possible to regain the internal screen with "echo mid | sudo tee /sys/class/drm/card0/device/power_profile" from the terminal. While the screen is visible now this results in a ghost image and I have to reboot to fix this.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-video-radeon 1:7.3.0-1ubuntu3.1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Sep 21 08:03:35 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-11-26 (298 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
SourcePackage: xserver-xorg-video-ati
UpgradeStatus: Upgraded to trusty on 2014-04-22 (151 days ago)

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug trusty
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Change of screen resolution results in grafik disruption
https://bugs.launchpad.net/bugs/1372031
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