Moving thread to the Hardware section.
Which version of ubuntu are you using?
What video card(s) do you have? This should help identify them:
sudo lspci -vnn | grep -A12 VGA
^^^Are you saying that the brightness changes when you press the volume keys or did you mean the brightness keys?
my volume 'fn' works, up and down properly
my brightness does not, it will go close to all the way high, or low when hitting (fn)+volume keys
I wouldn't mind having a look at your dmesg log file. Post it like this:
...and post back the link that is generated.