Comment 2 for bug 1045662

StacktraceTop:
 gnome_rr_screen_get_dpms_mode (screen=screen@entry=0x0, mode=mode@entry=0xbf8a0b9c, error=error@entry=0xbf8a0c0c) at gnome-rr.c:1158
 gnome_rr_screen_set_dpms_mode (screen=0x0, mode=mode@entry=GNOME_RR_DPMS_ON, error=error@entry=0xbf8a0c0c) at gnome-rr.c:1242
 idle_set_mode (manager=manager@entry=0x87aa800, mode=mode@entry=GSD_POWER_IDLE_MODE_NORMAL) at gsd-power-manager.c:3026
 idle_evaluate (manager=0x87aa800) at gsd-power-manager.c:3196
 g_cclosure_marshal_VOID__VOIDv (closure=closure@entry=0x87d6b48, return_value=return_value@entry=0x0, instance=instance@entry=0x8858118, args=args@entry=0xbf8a0eec "\030\303\236\264", marshal_data=marshal_data@entry=0x0, n_params=n_params@entry=0, param_types=param_types@entry=0x0) at /build/buildd/glib2.0-2.33.10/./gobject/gmarshal.c:115