Nice, I have NetBSD v10.0 on my Thinkpad T420, and issues I had with an external monitor has been fixed plus is is more zippy.

The only remaining issue I have with 10.0 is when the system is under very heavy load, Xorg can get temporarily corrupted after about 1 hour of the job running. I create PR 58217 for that issue.

In reality, I think very few people will ever run into this problem, but hoping for a 10.x fix some day :)