I’m sure there are some people out there who are currently pulling their hair out while looking at the terminal because of this problem : Latest Dapper xserver-xorg upgrade might break the xserver
In my humble opinion it would be great if we had a way for the Xserver to fall back to vesa (with a lower resolution) in Edgy or Edgy+1. See this specification
It would also be useful to be able to automatically revert to the last working xserver-xorg version if needed.
This XserverFailover spec will be useful because both users and developers are human and are able to make (occasional) mistakes.