My brightness buttons work properly after wake up, not after boot. Solution working for me right now: After boot, put the computer to sleep and wake it up again.
Didn't need to do any kernel recompiling, which, it seems, leaded to the same result anyway.
Oh and if any of you are having trouble booting up after the second restart of your computer after installing the nvidia drivers, I found the following: After you install the drivers and reboot, notice that your xorg.conf timestamp has changed. Nvidia performs some changes after boot that mess everything up. To prevent this:
1) Install nvidia drivers as described by cberner.
2) Reboot.
3) Runagain.Code:sudo nvidia-xconfig
4) Reboot as many times as you wish now without trouble.
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