topstar-latop: ignore 0x82 event

Event 0x82 is emitted whenever a backlight event happens (brightness
change, backlight on/off).  For instance, when display is switched
off after a timeout, event 0x82 is emitted, and along with it a keypress
which switches the display back on again.

This patch adds 0x82 to the event ignore list so that the display stays
off when it is automatically switched off.
Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/topstar-laptop.c

@@ -41,6 +41,7 @@ static const struct key_entry topstar_keymap[] = {
 	{ KE_KEY, 0x8c, { KEY_MEDIA } },
 
 	/* Known non hotkey events don't handled or that we don't care yet */
+	{ KE_IGNORE, 0x82, }, /* backlight event */
 	{ KE_IGNORE, 0x8e, },
 	{ KE_IGNORE, 0x8f, },
 	{ KE_IGNORE, 0x90, },