I also experienced black screen when I choose to only show the external screen.
I seems like this is a bug in the i915 display driver. There is a patch that might be relevant: https://patchwork.kernel.org/patch/1681851/.
I also experienced black screen when I choose to only show the external screen.
I seems like this is a bug in the i915 display driver. There is a patch that might be relevant: https:/ /patchwork. kernel. org/patch/ 1681851/.