Commit: "drm/nouveau/kms: take mode_config mutex in connector hotplug path" https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/nouveau/nouveau_connector.c?id=0a882cad https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/patch/drivers/gpu/drm/nouveau/nouveau_connector.c?id=0a882cad solves only WARNING(s), everything else is equally broken - "xrandr-ing" with GL(X) compositing. Tested with 4.5.0-0.rc0.git3.1.fc24.x86_64