As I reported earlier in another thread, Adrenalin 2020 (19.12.2, 19.12.3) broke HDR which worked fine on last Adrenalin 2019 drivers (19.12.1, was originally fixed in 19.10.1).
Now the 20.1.1 drivers seemed to fix the HDR issues, but I was mistaken it seems.
SDR-games seem to work fine, though with most the screen is always in "DisplayPort HDR" mode even if the game is SDR, which is ok since it still seems to look right.
On Windows desktop everything seems to work, it's not too dim, washed out and HDR videos seem vivid like they should.
In Hellblade: Senua's Sacrifice the HDR works, but you need to alt+tab out of the game and back in after launching it to make it work - otherwise the screen is just too dark.
In Star Wars: Battlefront II HDR is completely broken. The display says it's in DisplayPort HDR mode, but the image is washed out / grey / dim. Alt+tabbing, switching HDR off and on again etc doesn't help, going borderless mode makes everything so dark you can barely see anything on the screen.
Ryzen 7 3700X @ stock
16GB (2x8GB) DDR4-3600 CL16
ASUS Prime X570 Pro
Sapphire RX 5700 XT Pulse
Creative Sound Blaster Zx
750W Seasonic Focus+ Platinum
Windows 10 Pro x64, build 1909
Samsung C32HG70 (DisplayPort)
edit: UPDATE: Star Wars was because of Radeon Image Sharpening apparently, disabling it fixed it for me.