Comment 2 for bug 1305006

StacktraceTop:
 x_server_local_get_authority_file_path (server=server@entry=0x7f4a4000a960) at x-server-local.c:304
 seat_xlocal_run_script (seat=0x22559e0, display_server=0x7f4a4000a960, script=0x224e070) at seat-xlocal.c:290
 run_script (seat=seat@entry=0x22559e0, display_server=display_server@entry=0x7f4a4000a960, script_name=0x2260a10 "/sbin/prime-offload", user=user@entry=0x0) at seat.c:302
 display_server_ready_cb (display_server=0x7f4a4000a960, seat=0x22559e0) at seat.c:1197
 _g_closure_invoke_va (closure=0x2281970, return_value=0x0, instance=0x7f4a4000a960, args=0x7fffc7c0b568, n_params=0, param_types=0x0) at /build/buildd/glib2.0-2.40.0/./gobject/gclosure.c:831