xorg-x11 update may have broken my system

[sguazt sguazt]

Hi,
  I have a similar problem.

This morning I updated my laptop (Dell Latitude D505) with last fc4 updates, 
i.e. xorg-x11, qt-devel, dia.

After those (and after restarting X) X crashed (and the screen too).
Usually I boot into init 3 and then I "startx" X (with enlightenment as a 
wm).
After those updates every time I try to start-X the screen crash; I press 
Ctrl-Alt-Backspace but the screen is always corrupted (i.e. I don't see the 
textual console) and the only way I can restore it is by typing reboot (or 
poweroff) 8-|

My graphics chipset is the Intel i855GM.

The bad thing for me is that probably this week I have to give up to a Quake 
match :((((

Any help is appreciated!!

Thanks guys!!

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