Should mention, I'm running Ubuntu 9.10 x86_64. Attaching the output of
lspci/dmesg.
Fn-F5 and Fn-F6 do seem to go back and forth along a consistent set of
.. brightness settings, but the set is in no way ordered by scale.

cat'ing /proc/acpi/video/VGA/LCDD/brightness gives the following
information, which doesn't seem to change at all when the screen
brightness is altered by way of the Fn keys:

levels:  0 3 6 9 12 16 19 21 24 27 29 30 32 33 34 36
current: 21

The screen brightness does change (as does the 'current' value) when I
write an integer to that file (e.g. echo 3 >
/proc/acpi/video/VGA/LCDD/brightness), though interestingly the
brightness for 0 isn't nearly as dim as what can be attained using the
Fn keys. Likewise, 36 seems to be a touch less bright than the greatest
possible brightness from the Fn keys.

-- 
hotkeys adjust brightness non-monotonically on EEEPC 1005PE
https://bugs.launchpad.net/bugs/512567
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