Description of problem:

radeon driver fail to grab automatically the right modline of one of the two monitor

Version-Release number of selected component (if applicable):
xorg-x11-drv-ati-6.8.0-14.fc9.i386


How reproducible:

Always

Steps to Reproduce:
1. Boot with my hardware and setup ... 
2.
3.
  
Actual results:

The VGA-0 monitor is not working ... unless i do : 

xrandr --output VGA-0 --mode 1280x1024 --pos 1680x0

and xrandr is very confused ... :
Screen 0: minimum 320 x 200, current 2960 x 1050, maximum 2960 x 2074
VGA-1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 473mm x
296mm
   1680x1050      60.0*+   60.0     60.0     59.9  
   1920x1080      59.9  
   1600x1024      60.2  
   1400x1050      70.0     60.0     60.0  
   1280x1024      75.0     60.0     60.0  
   1440x900       59.9     60.0  
   1280x960       75.0     60.0     60.0  
   1360x768       59.8     60.0  
   1152x864       75.0     75.0     75.0     70.0     60.0  
   1280x720       75.0  
   1024x768       75.1     75.0     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     66.7     60.0  
   720x400        70.1  
VGA-0 connected 1280x1024+1680+0 (normal left inverted right x axis y axis)
376mm x 301mm
   1280x1024      60.0*+   75.0     60.0     60.0* 
   1920x1080      59.9  
   1680x1050      59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1440x900       59.9  
   1280x960       60.0     60.0  
   1360x768       59.8     60.0  
   1152x864       75.0     75.0     75.0     70.0     60.0  
   1024x768       75.1     75.0     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     72.8     75.0     66.7     60.0     59.9  
   720x400        70.1  
S-video disconnected (normal left inverted right x axis y axis)

Most mode simply do not exist on VGA-0

Expected results:


Additional info:

Forcing Modeline in config do not change anything and this setup work flawlessly
on F8 ...