I have the same problem. Equal behavior. I think it is related to display 
driver kernel module.
Output of $ cat /proc/acpi/video/VGA/LCDD/brightness :
levels:  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
current: 13

Value from Power Manager Brightness Applet (2.24.0) and current value from (cat 
/proc/acpi/video/VGA/LCDD/brightness):
0%: 13
5%: 12
14%: 11
...
86%: 2
95%: 1
100%: 0

$ modinfo i915
filename:       
/lib/modules/2.6.27-11-generic/kernel/drivers/gpu/drm/i915/i915.ko
license:        GPL and additional rights
description:    Intel Graphics
author:         Tungsten Graphics, Inc.
srcversion:     3B6A722C9508FF545045921
depends:        drm
vermagic:       2.6.27-11-generic SMP mod_unload modversions

** Summary changed:

- luminosity doesn't work correctly
+ brightness adjustment doesn't work correctly

** Tags added: brightness flipped intel inverted luminosity weird

-- 
brightness adjustment doesn't work correctly
https://bugs.launchpad.net/bugs/312997
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