Comment 2 for bug 1666332

StacktraceTop:
 real_assign_crtcs (screen=screen@entry=0x2108260, outputs=outputs@entry=0x2423330, assignment=assignment@entry=0x2448c30, error=error@entry=0x7ffde435a100) at gnome-rr-config.c:941
 crtc_assignment_new (screen=0x2108260, outputs=outputs@entry=0x2423330, error=error@entry=0x7ffde435a100) at gnome-rr-config.c:1068
 gnome_rr_config_apply_helper (config=config@entry=0x7f18940253d0, screen=<optimized out>, persistent=persistent@entry=0, error=error@entry=0x7ffde435a100) at gnome-rr-config.c:628
 gnome_rr_config_apply (config=config@entry=0x7f18940253d0, screen=<optimized out>, error=error@entry=0x7ffde435a100) at gnome-rr-config.c:650
 apply_configuration (manager=manager@entry=0x20dd230, config=0x7f18940253d0, timestamp=timestamp@entry=26805428) at gsd-xrandr-manager.c:347