Public bug reported:

Binary package hint: linux-source-2.6.20

Changing the screen brightness with Fn+Home/End on a Thinkpad X60s makes
the screen go blank, and you need to restart X to get it back (console
works).

a workaround is to blacklist 'video.o' from loading and reboot:

http://www.thinkwiki.org/wiki/Installing_Kubuntu_6.10_on_a_ThinkPad_X60s_2
http://www.mail-archive.com/[email protected]/msg00092.html

and it seems to be a kernel bug.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Thinkpad X60s: changing the screen brightness blanks screen
https://launchpad.net/bugs/87028

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