Comment 2 for bug 1503420

StacktraceTop:
 init_config_from_preferred_mode (output=0x5136e90, config=0x6356260) at backends/meta-monitor-config.c:1104
 make_linear_config (self=<optimized out>, max_width=<optimized out>, max_height=<optimized out>, config=0x58e4680, n_outputs=2, outputs=0x5136e90) at backends/meta-monitor-config.c:1182
 make_default_config (use_stored_config=<optimized out>, max_height=<optimized out>, max_width=<optimized out>, n_outputs=<optimized out>, outputs=0x5136e90, self=0x3bf2120) at backends/meta-monitor-config.c:1296
 meta_monitor_config_make_default (self=0x3bf2120, manager=0x26602a0) at backends/meta-monitor-config.c:1381
 meta_monitor_manager_on_hotplug (manager=<optimized out>) at backends/meta-monitor-manager.c:1286