trouble with key bindings

[Louis-David Mitterrand]

Hello,

I am trying to bind the Pause and Break keys on my laptop to start and
stop laptop mode. I copied the keycodes from xev:

	KeyRelease event, serial 28, synthetic NO, window 0x2200001,
		root 0x48, subw 0x0, time 8177540, (570,678), root:(571,695),
		state 0x0, keycode 110 (keysym 0xff13, Pause), same_screen YES,
		XLookupString gives 0 bytes:  ""

	KeyPress event, serial 28, synthetic NO, window 0x2200001,
		root 0x48, subw 0x0, time 8178159, (570,678), root:(571,695),
		state 0x4, keycode 110 (keysym 0xff6b, Break), same_screen YES,
		XLookupString gives 0 bytes:  ""

And added them to my rc.xml file:

	<keybind key="Pause">
		  <action name="Execute"><execute>su -c "/etc/init.d/laptop-mode start"</execute></action>
	  </keybind>
	  <keybind key="Break">
		  <action name="Execute"><execute>su -c "/etc/init.d/laptop-mode stop"</execute></action>

But the key presses are not recognized.

Did I miss something?

Thanks,