[ltp] brightness control erratic on T430s with 3.10 kernel

[kionez]

#include <Andrew Turner.h>   // created 02/09/2013 16:06

> This discussion may be of some help to you: 
> https://bbs.archlinux.org/viewtopic.php?id=158775
> 
> using acpi_osi='!Windows 2012' smoothed out the brightness control
> on my t430s

It works fine for me, Thinkpad T530.

thanks!

k.