Hi Dana, okay, radeontool might be useful in debugging this. After
installing it, you run it like this:
radeontool regmatch '*' > regdump_good.txt
radeontool regmatch '*' > regdump_broke.txt
Run it two times. Once when you have a good, working screen (for any
driver including -vesa), and once in the broken case (either from the
tty console or logged into the sick box remotely).
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Incomplete
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[lucid] Broken backlight control with Radeon open-source drivers
https://bugs.launchpad.net/bugs/534677
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