HDR is a superset of 10 bit support. Shared graphics mode on Windows 10 does not support HDR 10 yet, nor do any desktop apps. HDR is 10 bit, 10 bit is not HDR.
https://mspoweruser.com/microsoft-bringing-native-hdr-display-support-windows-year/
Shadow Warrior will work with HDR on PC, but only in exclusive mode. Again, there's no proof from the original article that AMD is not pushing 10 bits in HDR mode. I think that's what is so frustrating is that the headline makes it sound like a fact but there's no actual proof that it's a deficiency on AMD's part or if the game is "faking" HDR in some way (not using 10 bit pixels in the entire rendering pipeline).
To Steevo, thanks for confirming you have no experience with HDR 10 or any 4K HDR format. Not that your shitbox could even push 4K anything.
Asshole.
To Xzibit, I completely missed the tiny source link, whoops. It looks like the source article is quoting yet another article, which makes this third hand news. Still a whole bunch of non-news. As for my TV, I have a P series now, and though the 1000 nit mastering is a big part of HDR, it's only part. The big deal is 10 bit color for better reds and greens and little to no dithering. I play UHD blurays and Forza Horizon 3 on my TV and the difference is shocking. I never realized how much tone mapping they did in 8 bit content until I saw dark shadow detail and the sun in the same shot.