After trying to update the Intel video driver to 20181203:
> As of Dec 24 11:55:52 pkg[18901]: xf86-video-intel upgraded: > 2.99.917.20180906 -> 2.99.917.20181203 the problem is resolved. > The issue is not resolved for me yet. I continue to have screen flickering and rendering issues. However, by switching over to the modesetting driver, the issue doesn't occur for me anymore.
