I have a RX 460 running under 64 bit W10 pro, and HDR does not work on the display port with a HDMI adapter cable, but it works on the same monitor using a HDMI connection. Is this expected operation?
No,the adapter cable is breaking HDMI compatibility,or it converts to an inferior standard.Since HDR is available only on HDMI 2.0a and later I suspect that the adapter converts the signal to HDMI 1.x .
I posted the question as to whether the cable was HDR compatible on the Amazon page from where it was purchased, and someone just responded yes and as they were using it on their new Philips Smart TV. I think that suggests there might be a problem with the card being able to provide HDR on its displayport.
stick with HDMI or buy a new DP cable that does support HDMI 2 or higher
HDMI 2.1 is now the new standard
Most cards can do deep color fine, HDMI can do that and so can DisplayPort
HDR is more marketing than anything for better color quality etc
What is the exact adaptor cable make/model ?
Are your ICC profiles set up correctly(as well as the secondary default settings match).?
The first was a Cable Creations, unknown model number, confirmed by manufacturer that it doesn't support HDR.
The second was UGreen model 10202, confirmed by manufacturer that it doesn't support HDR.
I'm now using a Sailfish 4K gaming edition:
Amazon.com: Sailfish DisplayPort to HDMI Cable - Gaming Edition, HDR & FreeSync, Cable Wrap Included (6 Feet, Blue): Ele…
It acts the same as the first two - washed-out and "fuzzy" display. I haven't changed any settings from their defaults, except to set the graphics to 30 Hz from 60 Hz, with the same 3840 x 2160, True Color (32bit) from the list of valid modes for the Radeon RX 460. Windows turns off HDR if I try to run at 60Hz.
When I run the TV / monitor HDMI-to-HDMI to the card, HDR works fine. Am I missing something?
Radeon settings are 8 bpc color depth, RGB 4:4:4 Pixel Format PC Standard (Full RGB).
Retrieving data ...