I just installed Ubuntu 19.04 on my Dell Precision 5530 (dual boot with Win10) it works fine if not for the Nvidia Quadro P2000 (Suspend/Resume problems...).
I have a problem with my external display (27" - 4k iiyama). Dual screen works fine on Windows, it worked fine on Ubuntu 18.04 and 18.10 but on my Ubuntu 19.04 fresh install the second screen is detected (showed in screens settings) but there is a "No signal detected" message on the screen.
What I tried :
I got it to work for like 5 minutes by switching to 720p and then settings both screens to 4k again but after restart it doesn't work anymore.
Any idea ?