Comment 3 for bug 1436861

StacktraceTop:
 engine_update_composite_device (manager=0x1d3f200, original_device=0x7f4a5800f270) at gsd-power-manager.c:781
 device_properties_changed_cb (device=0x7f4a5800f270, pspec=0x50, manager=0x1d3f200) at gsd-power-manager.c:1631
 g_closure_invoke (closure=0x1db52a0, return_value=0x0, n_param_values=2, param_values=0x7fff028ab120, invocation_hint=0x7fff028ab0c0) at /build/buildd/glib2.0-2.43.92/./gobject/gclosure.c:768
 signal_emit_unlocked_R (node=node@entry=0x1cadbb0, detail=detail@entry=1247, instance=instance@entry=0x7f4a5800f270, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff028ab120) at /build/buildd/glib2.0-2.43.92/./gobject/gsignal.c:3549
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fff028ab2b0) at /build/buildd/glib2.0-2.43.92/./gobject/gsignal.c:3305