Dear AMD engineers,
my hw configuration is particular.
I've bought a Mac Pro 7.1 with the Radeon Pro 580X
I've installed Windows 10 Pro and I want to use the Radeon Pro 580X thunderbolt 3 ports with my LG 5Kx2K 10 bit monitor.
My monitor is the model LG 34WK95U-W HDR10/600 compatible
Unfortunately the Radeon Pro 580X has a lot of issues with this monitor and thunderbolt 3 ports. Setting Windows 10 in HDR mode the monitor crashes, I have to unplug the power cord to reboot it. The thunderbolt 3 cable is ok, it's the original one provided by LG. I also tested other brands certified tb3 cables.
Booting my Mac Pro 7.1 with Windows 10 Pro (bootcamp) the monitor doesn't respond if it's set to Displayport 1.4, I have to set it to Displayport 1.2
After the booting I can force the monitor to run with Displayport 1.4, finally on Windows 10 Pro I can see the HDR option but trying to enable it will crash the LG monitor.
It seems the Radeon Pro 580X isn't compatible with HDR 10 bit option on Windows 10 using the thunderbolt 3 ports.
It's very strange because on MacOS this gpu can display HDR output through the thunderbolt ports on the Apple XDR monitor at 6K 60Hz.
I think the AMD Radeon Pro 580X drivers aren't capable to display 10 bit HDR signal through the thunderbolt 3 on Windows 10.
On the same system I've installed also 2 RTX2080Ti working perfectly with this LG monitor using the displayport cable.