I have a mid-2011 Macbook Air. Sometime in the recent past, the Function key row (which I used for volume control, brightness control, keyboard backlight control, etc) has stopped working.
By stopped working, I mean it seems like those keys have been remapped. For example, the "increase volume" function key shows the widget screen (with the clock, calculator, etc). Another function key shows the app dashboard.
I fiddled around with all the available keyboard settings in "System Preferences" but got nowhere.
Once, after a reboot, the function key functionality was reinstated, but all too briefly. After a few hours, the errant behavior has resumed.
Any pointers or ideas?