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It's rare to see "Debian" and "ease-of-use" written in the same sentence ;) Debian is a very well though out distribution, intended to cover a broad cross-section of needs, from server through to desktop. You can have a superb Debian desktop... but, you won't be expecting the installer to do...

On the basis that during our efforts, it didn't work with either the AVR plugged in, or the computer plugged in directly, I'm gonna go with "doesn't work" being the final answer...

No, I'd suggested that because I'd assumed that your Roku wasn't getting 4K for the same reason that your computer wasn't - which is that the AVR doesn't pass correct EDIDs to video sources. The Zerone box only provides a valid EDID - it does not impact HDCP - High Definition Content Protection...

Not really, no - because your HDMI-2 ARC connector's broken :( On your TV, only HDMI-1 and HDMI-2 are really 4K capable, of which, only HDMI-1 is working. If all had been working well, you could've put an HDMI splitter onto HDMI-1 to receive all your gadgets, then the TV would've controlled the...

Actually... D~, sorry to be the bearer of bad news. I did some more reading into your Denon AVR-S500BT - the S500BT is NOT HDCP2.2-compliant. No matter what we do, your Roku will not display 4K via the Denon unit. Your TV is HDCP2.2-compliant, however. HDCP2.2-compliance was only introduced...

Perfect! Those files check out OK, so all done where your computer's concerned. Which version of Roku do you have, by the way?

Debian feeds Ubuntu. Ubuntu adds their usability enhancements. Mint fixes Ubuntu's bugs and thus makes a "just works" distro, a release out of date.

Do this as your normal user, no need for root permissions. (DON'T sudo these if they go wrong to ensure you can't accidentally delete anything): cd ~ mkdir vidbackup cd vidbackup cp /etc/X11/xorg.conf ~/vidbackup/ cp /etc/X11/edid.bin ~/vidbackup/ cd ~ tar czf vidbackup.tar.gz vidbackup Once...

Yes. Take a copy of /etc/X11/edid.bin and /etc/X11/xorg.conf. Better yet, upload /etc/X11/edid.bin onto here. That way if you ever do need to reinstall, I can give you instructions to get back to where you are today very quickly, as we've now identified the problem and don't need to go through...

D~, I set out to get your computer to talk to your TV through the AVR at a resolution of 4K@60Hz on updated drivers, and that is what I've done. Your Roku is a closed hardware device and there's nothing much that I can do personally to make it behave properly. I think at this point I should...

Well, I changed the product. My understanding is you hook it up in between the Roku and the AVR, set the daisy when to provide a 4K EDID and it will provide one instead of trying to negotiate resolution with the avr.

Excellent! For your Roku through the AVR, you'll need something like this EDIT: https://www.amazon.com/Zerone-Feeader-Manager-Emulator-Distance/dp/B07MZ69D1H/ref=mp_s_a_1_8?keywords=hdmi+4k+edid+emulator&qid=1564001405&s=gateway&sr=8-8

I'm only looking at your computer, not your Roku - different hardware, different problems

So you have 4k@60Hz and sound through the receiver?

Yes, switch to receiver now

Is that through the AVR... and do you have sound?

OK, having thought through your screenshot, the following should work: sudo cp /home/daniel/xorg.conf /etc/X11/xorg.conf If it does, then reboot and let me know the outcome.

ls /home/daniel/Downloads and then ls /home/daniel

Delete that one and try this one instead.

OK, exercise done. Let's try that again I've attached the file this time. I promise. I've checked and everything. First delete both copies of xorg.conf.tar.gz that you've already downloaded, then download the one attached to this message. Then (and don't forget this time ;)): tar -xzf...