I see two possible solutions:

1. To change g-p-m so it detects proper brightness steps to
increase/decrease.

2. To change acpi video module. This can be:
a) Using real values for brightness levels (0 to 7  instead of 12 to 100 in my 
case).
b) Changing how intermediate values affect brightness. I mean if I'm at 24, and 
I try to change to 23 or 25, it should change to the next level (12 or 36) to 
avoid problems like this.

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Cannot increase display brightness with hotkeys
https://bugs.launchpad.net/bugs/140839
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