Comment 50 for bug 722377

This problem has not been solved yet it appears. I can confirm it is not working on a Dell Latitude E5440 with Ubuntu 12.04 LTS, kernel 3.11.0-24-generic. The FN-F8 key is still not working correctly. I get similar key scan codes as JeffH posted:

I pressed FN-F8 twice here, and then FN-Arrow up (brightness)

# acpi_listen -c 1
^[p
^[p
^@video LCD 00000086 00000000

Here I pressed FN-Arrow up (brightness) first and then FN-F8

# showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]

press any key (program terminates 10s after last keypress)...
keycode 28 release
keycode 225 press
keycode 225 release
keycode 125 press
keycode 25 press
keycode 25 release
keycode 125 release