Comment 12 for bug 1326161

Under Kernel 3.13 and 3.15.0-031500-generic the Toshiba hotkeys Fn+F6 and Fn+F7 to control screen brightness (Satellite L300) only work after manually suspending through the system tray drop down menu and then resuming. Note the Suspend Hotkey Fn+F3 only works after manually suspending and resuming at least once. Hotkeys are lost on the next reboot or cold boot.

As a workaround I usually manually suspend and resume immediately after each boot.

In /usr/rc.local you can echo 3 or 4 to the graphics driver so your eyeballs don't fry from solar bright screen on boot ups. That workaround is documented in many Ubuntu forum threads.