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Discussion Starter #1
So I have a Onkyo TX-NR646, Samsung HDR 4K LCD and RTX 3090.

Using a HDMI 2.1 cable I plugged my RTX 3090 to the gaming input on my receiver, and then i connected another HDMI 2.1 cable from my receiver to my TV using OUT MAIN ARC.

I get 4K resolution and 5.1 sound, however I have lost the option in windows 10 for HDR.

If I connect my RTX 3090 directly to the TV I have HDR 4K but obviously don't have my 5.1.

Anyone know what I'm doing wrong and how I get 5.1, HDR 4K to both work?

Using Windows 10 with latest patch and latest graphics card drivers.

Thanks in advance for any help, it's bugging the hell out of me.
 

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Discussion Starter #3
PC -> HDMI -> TV -> Optical out -> receiver. Set TV out to bit-stream and not pcm.
My TV doesn't have optical. The thing that is strange is I used to have it all working, I moved home and thought maybe i'm setting up the cables wrong. Like i said, i get 5.1 and 4K just I have lost the option for HDR in Windows 10. Also i think before my control panel showed my TV brand (Samsung) whereas now it shows the name of the receiver.
 

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Two separate outputs

One to the TV, another HDMI cord out from the GPU for audio

You will have to make the AVR count as a TV then set that to audio out. Just have it mirror a low res monitor if you have one. If not can mirror or put it on the corner of your displays so it's out of the way.

IDK what the resource requirements of mirroring a 4k main display are, i just use an off monitor it might not be very resource intensive to just mirror 4k
 

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Don't mirror. Extend. And have the receiver monitor be 720p for minimal overhead (720p is the lowest resolution that will have full audio support). Put it on a corner (on windows, bottom right of main screen is what I use) to make it hard for the mouse to disappear onto that screen (but if it happens, mousing up and left will get it back). Bottom right as windows does not use that corner for anything so you're not likely to accidentally mouse there, unlike the top left (menu), top right (close button) and bottom left (start button).

Of course, the bottom right is the system tray but you generally deliberately mouse there to click an icon and nothing is actually at he corner. (Adjust position if you're one of those people who moves the task bar around the screen).
 

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On some devices you have to enable hdr for hdmi ports... It is not a setting on the Onkyo?
 
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