DisplayPort connection not detected on Windows, working only on Ubuntu 18.04...

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polik1

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I recently bought second monitor and I've been struggling to make it work with my motherboard, but to no avail... :(

Long story short - second monitor connected via Display DisplayPort is not detected at all in Windows 10. I've tried many combinations to make it work (cables, adapters etc.), but Windows is not detecting any connection. Of course new monitor works fine on HDMI. I've tried reinstalling drivers (even with DDU) and reinstalled Windows, nothing seems to work...

When I boot while connecing only one monitor via DIsplayPort, it's all black. Of course new monitor works fine on HDMI.

What is really strange, new monitor is detected while I boot to Ubuntu 18.04, but only in resolution 640x480 px. I need to manually force different resolution via command ($ xrandr --addmode DisplayPort-0 1920x1080) ant then voila - it works! :(

Can someone help me with this one? Windows is my daily OS...
__________________________
Main Board: B450M MORTAR MAX
Bios Version: 7B89v28
Video Card: integrated
PSU brand and model: SilentiumPC Vero M3 600W
CPU: AMD Ryzen™ 5 3400G
Memory: F4-3200C16D-16GFX Flare X DDR4-3200MHz CL16-18-18-38 1.35V 16GB (2x8GB)
SSD/ HDD: XPG SX8200 PRO PCIE GEN3X4 M.2 2280 SOLID STATE DRIVE
OC: only AMP profile
Operating System: Ubuntu 18.04, Windows 10

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