Please attach your /var/log/Xorg.0.log file.
If you can from after reproducing this issue (or /var/log/Xorg.log.old)
** Package changed: ubuntu => xserver-xorg-video-ati (Ubuntu)
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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Ubuntu unusable by default with ATI HD4670 video card + monitor on DVI link
(blank screen).
https://bugs.launchpad.net/bugs/387013
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