So my Acer uses the "Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller" aka Intel GMA 4500m. Alas I can not adjust the brightness via the cool ass function (Fn) keys on the keyboard. A little meter pops up and tells me the brightness is adjusting, yet it is not. There are a few fixes out there for this, modifying your grub, etc etc. But the one I like the most goes something like this.
max bright :
sudo setpci -s "00:02.0" F4.B=00
mediumish bright :
sudo setpci -s "00:02.0" F4.B=C1
screen off :
sudo setpci -s "00:02.0" F4.B=FF
Changing the last two numbers/letters (hex) gently scales the brightness up and down.