I have new Dell XPS 15 7590. I got a Dell dock WD19TB which I was using for some time. Suddenly today I started to experience strange problem. When I connect my laptop to dock, after few minutes it would go to sleep. When I then press the power button to wake it up it wakes only for few seconds and then goes to sleep again. So basically I can not use it at all while connected to dock.
Do you please have any idea what might be wrong and how to fix it?
I first thought it is a problem with a dock but ruled it out by having connected macbook without any problem for over an hour.
Then I thought it is due to drivers but I used Dell Update and checked that everything is up to date.
I also tried running other system (ubuntu) and same problem is there.
It looks like it is a problem with laptop itself.
I was experiencing the same problem, with the same hardware (XPS 7590 and WD19TB) after the latest BIOS update.
I was able to fix it by going into BIOS -> thunderbolt adapter configuration -> choose "security level - no security ".
Hope it helps.
I am having the same issues with my XPS 9500, I know it's different, but I am going to see if that can fix the problem anyway.