I do not know if anyone knows of this but have you tried the following:

for Ubuntu:

Type in a terminal :

sudo gdmsetup -> In the general tab tick the "Restart the X server with
each login"

for Kubuntu:

you've got to add or uncomment the line

TerminateServer=true

in the [X-:*-Core] section of the kdmrc-File (/etc/kde3/kdm/kdmrc) -
beware of the ':', there is a similar named section without it, too!

Seems to work for many.

-- 
laptop hangs when switching video mode
https://bugs.launchpad.net/bugs/127101
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