I have more or less the same problem. I have a Pc, not a laptop, with
Ubuntu 8.10, Radeon X600. In my computer too, the monitor has a problem
in mantaining brightness stability. It randomly changes in the first 10
minutes of activity of the computer, going down. I attach the lspci
output and the Xo
** Attachment added: "xorg.log"
http://launchpadlibrarian.net/21882148/xorg.log
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Random change of Screen brightness
https://bugs.launchpad.net/bugs/316567
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