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Two DELL displays 20" and 19". Mirroring/cloning in native resolution passed, display extension is limited to 1600x1600, I'd need 1600+1280 px in width at least. 

Screen 0: minimum 320 x 200, current 1600 x 600, maximum 1600 x 1600
DVI-I-0 connected 800x600+0+0 (normal left inverted right x axis y axis) 367mm x 275mm
   1600x1200      60.0 +
   1400x1050      74.8     60.0  
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.0     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3*    56.2  
   640x480        75.0     72.8     75.0     59.9  
   720x400        70.1  
DVI-I-1 connected 800x600+800+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0 +   75.0     60.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.0     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0*    60.3     56.2  
   640x480        75.0     72.8     75.0     59.9  
   720x400        70.1
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