second display only shows "static video"

[FullPlastik]

Hey
i just upgraded my GPU (amd R390x -> RX 5700XT) and now the second screen isnt working properly. it only shows this "static video" or what ever you would call it.
 

 

The main monitor is plugged in with DisplayPort and the second monitor, which is a Pen Display (huion kamvas pro 13), with HDMI. The cabel is kind of like a spliter with power/USB/HDMI in and USB-C out connected to the display.
When changing the resolution or a setting in the adrenalin software it displays the screen correctly for a second and than back to static. 
The weird thing is that if i plug in the main monitor in via HDMI it works and when i switch back to the (Pen)Display it also works like it is supposed to until i restart the system.

Things i tried:
 - power of/on display
 - unplug and plug in again (on both ends)
 - clean driver install with DDU
 - driver reinstall of the PenDisplay
 - playing around with resolutions and settings

let me know if you have any idea what the problem could be or i forgot to test something

Specs:
MOBO : ASUS Prime x470-PRO
CPU    : Ryzen R5 2600

RAM    : Corsair 16GB 3000hz 
GPU    : MSI 5700XT gaming x (with NZXT G12 + AIO) 

PSU    : Corsair TX650M (650W)
OS      : Win10 64
 

[Deadtravller]

Radeon settings > display > display name 

Then go to specs > override and disable HDCP support

[FullPlastik]

12 minutes ago, Deadtravller said:

Radeon settings > display > display name 

Then go to specs > override and disable HDCP support

thx it is working now

i actuly went in to those settings but it needed a system reboot and i didnt think it would fix the froblem an then i forgot
saved me alot of time thx

[Deadtravller]

36 minutes ago, FullPlastik said:

thx it is working now

i actuly went in to those settings but it needed a system reboot and i didnt think it would fix the froblem an then i forgot
saved me alot of time thx

No problem, any time