brigtness

Hi all, After having followed the guide my sierra install is working fine. But I do have some issues related to keyboard and touchpad: - in system preferences touchpad entry is a blank screen; how can I fix it? - for touchpad I really want to switch "on" tap to click functionality; how can I do...

Installed 10.10.4 but the screen keeps flickering and there is no transparency also no battery status. Brightness doesn't work either(no slider in display preferences) wifi card is not compatible so I've ordered a AR9280 (hope that's compatible!) please help!