Nevermind! Got it to work.
Had to go to System Preferences > Displays. Then move the brightness slider all the way to the right (i.e. MAX)
After that, my screen illuminated with brightness!
Also, I could finally manually adjust the brightness with fn+dim/bright keys (which didn't work before).
All in all, I guess the GMA Brightness Fix is already integrated into the latest EDP build, but for me, I just had to go in System Preferences to take advantage of it.
EDIT: Hmmmm, wait, it seems like the brightness settings reset every time I boot my laptop. I have to go to System Preferences and adjust the brightness manually every time. Maybe I DO need the GMA fix? And if so, where is it located in EDP? I looked under "fixes" and I can't find it.