Public bug reported:

I cannot reproduce the bug willingly. I try to describe.

Ubuntu is 7.04 amd64. Graphics Card is ATI X300. Bug occurs with vesa and ati 
driver. Sometimes at bootup, screen stay black. Keyboard is not working. 
Softoff is not working. But GDM plays login-sound. After starting KDE sometimes 
immediately, sometimes after a while, screen changes size (it is smaller then 
and does not fit into monitor size) Also in the console then (1-6). But when 
restarting X-Server, GDM shows normal screen size. When starting KDE, screen is 
small again. After a while, it changes back into original size. Sometimes it 
"tries" to change back, but does not success - it takes several "tries" till 
succeeding. I recognize the "tries" because the monitor "clicks". (I hope you 
understand - my english is not the best, see). When success, 
console-screen-size is also okay again.
Also the screensaver sometimes hangs. When activated, screen goes dark instead 
of showing selected screensaver - and no reaction to keyboard or soft-off.

Please tell me, when any additional information is needed.

** Affects: Ubuntu
     Importance: Undecided
         Status: New

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strange screen behaviour - changes size
https://bugs.launchpad.net/bugs/121641
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