I am using Dell Inspiron 6000, I starting to get this exact issue after 
upgrading from Ubuntu 8.04 to 8.10. Additional to this, I notice the screen 
brightness sometimes automatically increases on its own. And my keyboard input 
get disabled once I try to reduce the brightness. The workaround I usually do 
to get it back to normal is:
1) Press [Alt] + [Ctrl] + F1
2) Followed by  [Alt] + [Ctrl] + F7

Attached are the logs requested by magnus

** Attachment added: "bug296902.tar.gz"
   http://launchpadlibrarian.net/20302900/bug296902.tar.gz

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screen brightness adjustment causes mouse/keyboard input to stop  (possibly 
dell laptop specific)
https://bugs.launchpad.net/bugs/296902
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