Running a Lenovo Thinkpad L520 here, too.
Noticed this bug on Ubuntu 12.04 amd64 alpha 1 LiveCD. Also, on Ubuntu
11.10 (amd64) a vanilla 3.2.0 kernel compiled from kernel.org sources
has the exact same symptoms. No amount of twiddling with framebuffer
modules, initrds and such seemed to help. Addi
I also can verify this on Macbook 1,1. Also, the "xrandr" command above
fixes this issue for me too.
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[i945GM] xrandr backlight control is bizarre on Macbook
https://bugs.launchpad.net/bugs/367309
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