I have modified the '90-Add-guarded-brightness-stepping-functions' patch in 
order to get 12 levels of brightness adjustment, and changed the formulas used 
to calculate the next step for decreasing/increasing brightness in order to get 
constant steps.
It seems to work good on Samsung NC10.
Please try it.
Or else you can get a precompiled package (i386, lpia) from my PPA:
https://launchpad.net/~voria/+archive/ppa

** Attachment added: "90-Add-guarded-brightness-stepping-functions.patch"
   
http://launchpadlibrarian.net/25993877/90-Add-guarded-brightness-stepping-functions.patch

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Brightness control is slow and not costant with 
90-Add-guarded-brightness-stepping-functions.patch 
91-Using-guarded-and-scaled-stepping-when-dimming.patch
https://bugs.launchpad.net/bugs/345318
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