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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...

Whoa wait, I forgot to attach the file. Hold up another hour

Half you, half me I uploaded a file that didn't decompress properly. 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 /home/daniel/Downloads/xorg.conf.tar.gz Then: sudo...

OK, next: Download the attached file to /home/daniel/Downloads/. tar -xzf xorg.conf.tar.gz sudo su cp /etc/X11/xorg.conf /etc/X11/xorg.conf.20190724.backup cp /home/daniel/Downloads/xorg.conf /etc/X11/xorg.conf At this point, you should be able to reboot and confirm that you still get a...

Sorry, cat /etc/X11/xorg.conf

Ok, let me see cat /etc/xorg.conf We're on the home straight, as soon as I work out where your X settings are hidden

I'm not going to be too much use tonight, shattered and taking an early night. Can I see ls /etc/X11

OK, also download the file from post #162 and follow the instructions to extract and copy that file: ls /etc/X11/xorg.conf.d/ If there's not already a file called 20-nvidia.conf in there, then download the attached, and: tar -xzf 20-nvidia.conf.tar.gz sudo cp 20-nvidia.conf...

Can you also run ls /etc/X11/xorg.conf.d/ If there's not already a file called 20-nvidia.conf in there, then download the attached, and: tar -xzf 20-nvidia.conf.tar.gz sudo cp 20-nvidia.conf /etc/X11/xorg.conf.d/. At that point, in theory, you should be able to put your cables back computer...

OK, it's 11pm and I'm up at 5am, so need to sleep now. We'll get this working tomorrow - I'm pretty sure we're just a couple of button-clicks away. EDIT could you also: Open nvidia-settings In the menu-bar on the left click where it says "HDMI-0 HISENSE" then on its page click "acquire EDID"...

Not the grub.txt file from earlier today, the 4096x2160.bin.tar.gz file I attached in message 152.

Oh... and I guess you're on Wayland?

OK, you needed to download the file I'd attached to my last message before attempting to run the instructions - rookie mistake, but still, one that rather stopped the rest from working.