I don't have an F14 or F15 key!

Hi,

I've recently updated my 2012 27" iMac to Mac10.12.1 and found that I no longer have brightness control over my display from my keyboard using the F1 and F2 keys (marked with the brightness up and down logos, respectively).

All the doc from Apple indicates that brightness for desktop machines should be the F14 and F15 keys, but.. I don't have them. My keyboard physically stops with an Eject button appearing next to the F12 key. This is the keyboard that came with this machine, so I'm pretty certain this isn't an intended behavior!

I also note that the "Display" subsection in the Keyboard settings is completely missing, so I can't even re-map the setting.

Any ideas or solutions?

Thanks!

(Sidebar - did anyone else note that the 10.12.1 upgrade also re-enabled the Guest account? That was a bit of a surprise...)