and your evdev output on event10 confirms that the device *claims* to support KEY_BRIGHTNESS{UP,DOWN}.
If you don't get any events on either device, this must be fixed in the kernel keyboard driver, reassigning to linux. Any chance you could try to install/boot the raring kernel on current saucy, to check if that brings back the keys?
Thanks. Your attached udev.txt confirms that the keymap matching worked:
P: /devices/ platform/ i8042/serio0/ input/input4/ event4 KEY_85= brightnessdown KEY_86= brightnessup
[...]
E: KEYBOARD_
E: KEYBOARD_
[...]
and your evdev output on event10 confirms that the device *claims* to support KEY_BRIGHTNESS{ UP,DOWN} .
If you don't get any events on either device, this must be fixed in the kernel keyboard driver, reassigning to linux. Any chance you could try to install/boot the raring kernel on current saucy, to check if that brings back the keys?