Comment 2 for bug 934679

StacktraceTop:
 cd_device_connect (device=0x220df160, cancellable=0x2206eaa8, callback=0x81d29d0 <cd_device_connect_finish_sync>, user_data=0xbfbb8f9c) at cd-device.c:775
 cd_device_connect_sync (device=0x220df160, cancellable=0x2206eaa8, error=0xbfbb903c) at cd-device-sync.c:88
 gcm_prefs_add_device (prefs=0x221cbec0, device=0x220df160) at cc-color-panel.c:1703
 gcm_prefs_device_added_cb (client=0x2218d900, device=0x220df160, prefs=0x221cbec0) at cc-color-panel.c:1824
 g_cclosure_marshal_VOID__OBJECT (closure=0x224b6290, return_value=0x0, n_param_values=2, param_values=0x2235db68, invocation_hint=0xbfbb91a0, marshal_data=0x0) at /build/buildd/glib2.0-2.30.0/./gobject/gmarshal.c:644