We need to add an entry to 60-keyboard.hwdb, and we need to know DMI vendor and DMI product. You can either modify the file yourself using existing contents as example, or please post 'udevadm info' for the keyboard input device here.

(After modifying /usr/lib/udev/hwdb.d/60-keyboard.hwdb, 'udevadm --debug hwdb --update' should be run to generate the binary database and a reboot should be performed to use the new settings.)

$ grep -i 0xf8 /var/log/messages
kernel: atkbd serio0: Unknown key pressed (translated set 2, code 0xf8 on isa0060/serio0).

$ udevadm info --query=property --name=/dev/input/event4
P: /devices/platform/i8042/serio0/input/input4/event4
N: input/event4
S: input/by-path/platform-i8042-serio-0-event-kbd
E: DEVLINKS=/dev/input/by-path/platform-i8042-serio-0-event-kbd
E: DEVNAME=/dev/input/event4
E: DEVPATH=/devices/platform/i8042/serio0/input/input4/event4
E: DMI_VENDOR=Hewlett-Packard
E: ID_INPUT=1
E: ID_INPUT_KEY=1
E: ID_INPUT_KEYBOARD=1
E: ID_PATH=platform-i8042-serio-0
E: ID_PATH_TAG=platform-i8042-serio-0
E: ID_SERIAL=noserial
E: MAJOR=13
E: MINOR=68
E: SUBSYSTEM=input
E: USEC_INITIALIZED=38052

So it should be something like:
keyboard:dmi:bvn*:bvr*:bd*:svnHewlett-Packard:pn*:pvr*
KEYBOARD_KEY_f8=rfkill

Right? How do I get the Product name?

Created attachment 83686 [details] [review]
add 0xF8 to hwdb

"dmidecode -s system-product-name" told me what I needed to know.

Was never closed...

Pushed in http://cgit.freedesktop.org/systemd/systemd/commit/?id=4a792f4.