That was the fist page I saw to try to fix this. On that page I see VGA, BIOS, AUDIO, LAN, TouchPad, Others (Intel Rapid Storage), Wireless, Chipset, BlueTooth, and the ArmouryCrate hotfix.
There is no ASUS Keyboard hotkeys Driver entry, do you know where I can download that driver to check? I'll keep searching for it, thx!
UPDATE: I have the keyboard working right now but is in conflict with something of windows, when I restart it doesn't back on, if I suspend the notebook works just fine. If I'm using the a external keyboard a long time the keyboard starts working again randomly. I checked the flex and the connection it's ok.
Have you tried installing the latest ASUS Keyboard hotkeys Driver (Version 22.214.171.124)?