I am going to write out a workaround for this bug, mostly for my own
amusement, and possibly for a stray soul wanting to use Karmic on a Dell
mini 10, and searching here in desperation. Apparently, Ubuntu devs have
to much on their hands to look bugs, let alone fixing them. It's a
little sad, but understandable, besides, the bug is probably not that
important, after all, who doesn't have sunglasses these days. Obviously,
wearing sunglasses would be a workaround in and by itself, but that's
too obvious, and I wouldn't bother suggesting it, had it not come to
mind right now. You know, stray thought. Anyway, before this turns into
a novel, here comes the workaround.

Step one.
You have to add the following boot option: acpi_backlight=vendor. More info on 
how to do it can be found on ubuntuforums.org, specifically -> 
http://ubuntuforums.org/showthread.php?t=1313390&page=3&highlight=brightness.

Step two.
Now, you can adjust the default screen brightness, still ignored after step 
one, by adding the following line to /etc/rc.local:

echo 2 > /sys/class/backlight/compal-laptop/brightness

2 is my personal preference, but you can adjust it using any value from
0 to 7, where 7 = 100% brightness.

-- 
g-p-m brightness not applied anymore after rebooting
https://bugs.launchpad.net/bugs/503577
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