*** This bug is a duplicate of bug 215217 ***
    https://bugs.launchpad.net/bugs/215217

I've noticed that when you blacklist the video module, g-p-m reads
correctly the laptop_panel.brightness_in_hardware key (which should be
true for these laptops). On the other hand, when the video module is not
blacklisted, I get "not found. Assuming false". So, that's why
blacklisting the video module fixes this brightness problem in g-p-m for
you.

I *think* (please devs comment on this) the problem is g-p-m not reading
the laptop_panel.brightness_in_hardware key correctly, and that should
be the fix for this bug.

I'm attaching g-p-m verbose output after loading it (video module not
blacklisted).

** Attachment added: "gnome-power-manager.txt"
   http://launchpadlibrarian.net/17627453/gnome-power-manager.txt

-- 
fn buttons dim and brighten screen to fast
https://bugs.launchpad.net/bugs/264947
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