I've done more tests :
- Virtual size smaller than 2048 : neither 1600x800 nor 1280x1824 worked. I got 
the "low resolution" screen, and mtrr error in dmesg.
- Virtual size of the size of my LVDS : 1280x800, and no external screen 
connected. It didn't switch to gdm, and I just got the console login screen. No 
error on dmesg, but these errors in gdm log :


Parse error on line 48 of section Screen in file /etc/X11/xorg.conf
        "Virtual" is not a valid keyword in this section.
(EE) Problem parsing the config file
(EE) Error parsing the config file

Fatal server error:
no screens found


I haven't seen error about "Virtual" keyword when I got the external screen 
connected, so this may be normal.



I don't use the greed option anymore, but I use a new version of the intel 
driver that doesn't neet it : 
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/177492/comments/84

-- 
[Hardy] [regression] xorg with Intel driver crashes if Virtual > 2048
https://bugs.launchpad.net/bugs/188178
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