In my case:

Upgrading from Lucid Lynx. After grub and loading screen, the display
(an old CRT - AOC Spectrum 4v) lights starts to blinking (a possible
warning about Vsync or Hsync out of range.). Testing with an LCD Display
(Samsung Syncmaster 510n) shows X working, but with Flickering. Trying
to change resolution (from 1024x768 to 800x600), shows the same problem
as Hans. X crash, no virtual consoles. Black screen.

Testing with "vesa" X works with the old CRT...on this moment i'm writing from 
it!
"vesa" it's activated from /etc/X11/xorg.conf - by the way, the CRT it's 
incorrectly detected. Fixed. Trying with "savage" after the correction, problem 
still appears. The crash problem with the virtual consoles still continues, 
even with vesa or savage.

Possibly an xserver-xorg issue?

-- 
maverick: S3 savage (but also with vesa driver): X crash/restart after first 
switch to console and back, garbaged and unusable screen after second console 
switch
https://bugs.launchpad.net/bugs/660301
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