[patch] add more events the acpi addon

[Richard Hughes]

Attached patch adds more events to the acpi addon, to make the
brightness keys produce a dialog on a LENOVO X60 laptop. I've also
noticed:

-			case 4099: /* dpms off */
-				button = "display_off";
+			case 4099: /* battery */
+				button = "battery";

Danny - I think you added this code - are you sure it's display_off?
It's got a battery icon on this X60. I've also abstracted out
emit_device_from_computer as it's used in more than once now.

Please review.

Richard.
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