Strange issue with your latest driver and the brightness (fn) control - once the brightness slider hits half way the controls no longer work. If I manually drag the slider to the darkest setting, fn+f2 will increase the brightness until the midway point. The reverse is also true for the highest setting manually and the keyboard shortcut fn+1 to decrease.
Neither controls work whilst the slider is "stuck" at the halfway point however, until manually altered using the slider in System Preferences>Displays.
Merry Christmas mate, the rest of the patch seems perfect!