Created attachment 21896 [details]
corrupted screen

Hi,

When I rotate the secondary head on my LVDS+DVI setup to left or right, the terminal windows covering the bottom part of the screen become corrupted. See attached screenshot. This is an rxvt-unicode terminal, the problem does not appear with gnome-terminal. However I've also seen other application windows corrupted (like FTE : the folding text editor), or working fine (firefox).

I'm using the Xorg packages from debian experimental: 
xorg : 1:7.4~4
xserver: 2:1.5.3-1
xserver-xorg-video-radeon: 1:6.10.0-1
libgl1-mesa-dri: 7.2-1
libgl1-mesa-glx: 7.2-1

Hardware: 01:00.0 VGA compatible controller: ATI Technologies Inc M56P [Radeon Mobility X1600]

From xorg.conf:

Section "Device"                                                                
        Identifier  "raddev"                                                    
        Driver      "radeon"                                                    
        Option      "DynamicClocks" "on"                                        
        Option      "AccelMethod" "EXA"                                         
EndSection                                                                      
                                                                                
Section "Screen"                                                                
        Identifier "aticonfig-Screen[0]"                                        
        Device     "raddev"                                                     
        SubSection "Display"                                                    
                virtual   3360 1680                                             
        EndSubSection                                                           
EndSection                                                                      
                                                                                
Section "DRI"                                                                   
        Mode         0666                                                       
EndSection                                                                      
                                                                                
Section "ServerFlags"                                                           
        Option          "AIGLX" "on"                                            
        Option          "GlxVisuals" "all"                                      
EndSection                                                                      
                                                                                
Section "Extensions"                                                            
        Option          "Composite"     "on"                                    
EndSection                                    

If you need more info, I'm glad to provide.

Laszlo