I have never experience this issue with my previous GTX 1060 6GB.
My PC is hooked up to my 49" Samsung Screen via Displayport and to my TV via HDMI. Since i own the 6800 XT, this has already caused me some issues when switching with Windows Key + P from Display to TV and back again. Now i haven't been playing on the TV for some time already and unplugged the HDMI. PC is now only hooked up to my display on my desk.
Almost every time my PC goes into sleep mode and i wake it up afterwards, my desktop is displayed only for a few seconds until my display goes black. I can hear stuff still happening on my pc (playing music etc) but i don't see anything at all.
My display detects something on the displayport but can't display anything. If i unplug the DP from my screen, the display says "no input" and goes into sleep after some time. After i plug in my DP again, display wakes up, displays only a black screen.
I then have to reboot my pc in order to get a screen again.
This ONLY happens on the 6800 XT and does not happen on any other device. Not on my 1060 6GB, not on my two Notebooks i use for work, not on my Chromebook or my phone. The samsung display is not to be blamed as it seems like this is some strange driver issue with AMD Adrenaline whatever you call it.
Anyone else having black screen issues with 6800 XT?