Comment 3 for bug 446121

Sure, here it is, but still the keys works and Gnome recognize them. It looks more like the signal for actually changing the brightness doesn't work.

xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) *\(.*\), .*$/keycode \2 = \3, state = \1/p':
keycode 122 = (keysym 0x1008ff11, XF86AudioLowerVolume), state = 0x0
keycode 122 = (keysym 0x1008ff11, XF86AudioLowerVolume), state = 0x0
keycode 123 = (keysym 0x1008ff13, XF86AudioRaiseVolume), state = 0x0
keycode 123 = (keysym 0x1008ff13, XF86AudioRaiseVolume), state = 0x0
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
keycode 78 = (keysym 0xff14, Scroll_Lock), state = 0x0
keycode 78 = (keysym 0xff14, Scroll_Lock), state = 0x0
keycode 78 = (keysym 0xff14, Scroll_Lock), state = 0x0
keycode 78 = (keysym 0xff14, Scroll_Lock), state = 0x0