Have you tried simply killing the X session with CTRL+ALT+Backspace?  That
should boot you back to the GDM login screen.

What does xorg.conf say?  Do you have power management enabled?

On 5/14/07, jdtiede at bellsouth.net <jdtiede at bellsouth.net> wrote:
>
> Sometimes after leaving the computer running (monitor off) the screen
> comes back up as if thene is a partially miniblind in front of it. Ti may
> have been idle overnight or for an hour. I try to log out. If tha happens,
> it's o.k. when I log back in, leading me to believe it might be an X
> problem. Often I can't log off; enough attempts and possibly Ctrl-Alt-Del
> will get it to shut down and when it comes back it's o.k. This is Kubuntu,
> 64-bit.
>
>
>
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