RE: Trouble with XPS 15 9550, USB-C/Thunderbolt 3, and external monitors
Good afternoon. I have same issue. I believe I fixed by checking the "do nothing when lid closed" not only for when plugged in but also when on battery. I believe has to do with the charger in the dock not providing enough power. Seems silly given that my XPS 15 and the TB15 Dock are marketed together. Hope there is a fix soon as i really do not like that setting.