My x5dij laptop has no light sensor like the asus m50.

I've done the 'debugging' Scott Howard suggested in bug #368506, first
without restarting video kernel module.

keyevents reported by xev:

keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0

keycode 233 = (keysym 0x1008ff02, XF86MonBrightnessUp), state = 0x0
keycode 233 = (keysym 0x1008ff02, XF86MonBrightnessUp), state = 0x0

I think this is what's supposed to be. Though in contrast to e.g. the
letter keys, both events are reported instantly and not on key down/key
up. That's the case with all Fn+ - keys.

The events reported by acpi_listen are a bit strange: 
key brightness up produces:
video LCDD 00000086 00000000
hotkey ATKD 00000011 0000007e
and brightness down:
video LCDD 00000087 00000000
hotkey ATKD 00000020 000000fa
for the brightness down key, every press that is precedes by the same keypress 
produces two hotkey-events:
video LCDD 00000087 00000000
hotkey ATKD 00000020 000000fb
hotkey ATKD 00000020 000000fc
That's not the case for brightness up.

Over all I suppose this can't be our problem. So it may be a gnome-
power-manager problem.

The command
dbus-monitor --session 
"type='signal',interface='org.freedesktop.PowerManagement.Backlight'"
produces output only for the brightness down-key:

signal sender=:1.25 -> dest=(null destination) serial=102 
path=/org/freedesktop/PowerManagement/Backlight; 
interface=org.freedesktop.PowerManagement.Backlight; member=BrightnessChanged
   uint32 0

And the output of gnome-power-manager --verbose --no-daemon is in the
attached file. I inserted some blank lines between my keypresses.

** Attachment added: "gnome-power-manager.txt"
   http://launchpadlibrarian.net/29192147/gnome-power-manager.txt

-- 
Asus brightness keys only toggle between the lowest two levels
https://bugs.launchpad.net/bugs/224636
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