Created attachment 71129 [details]
screenshot

Driver Stack Details:
=====================

1)    Kernel-3.5.0-19-generic 
2)    drm-2.4.39
3)    Mesa 9.1-devel (git-484a8dc)   
4)    Xorg-server-1.11.4
5)    xf86-video-ati- master


System Environment:
===================

Asic         : Cape Verde XT-683D
O.S.         : Ubuntu-12.10 (64 bit)
Processor    : Intel(R) Xeon(R) E5620@2.40GHz
Memory       : 2 GB  

Steps to Reproduce:
===================

1) Connect two Display, 1. HDMI  2.Display Port 
2)#startx
3)#xrandr --output HDMI-0 --off
4)#xrandr --output HDMI-0 --auto

Observation : Desktop corruption observed on Enabling Output (Screenshot
attached) 
=============