I previously posted to Lemmy about my 8K TV and attempts to get it working on Linux. Based on suggestions there I bought an Intel Arc B580 which apparently supports 8K. But I can't get that on my TV. I've tried multiple cables, multiple video cards (including the NVidia one), and both HDMI and DisplayPort output from GPUs.

How can I find out where the problem is? Can I interrogate a HDMI or DisplayPort target to find out what modes it claims to support? Can I ask the GPU what modes are actually supported on it's outputs? If so how?

Are there any issues with driver support for 8k that will affect purchase choice?

I recently bought an 8k TV (which is not brutally expensive when refurbished) and want to connect my workstation to it. I went through the list of video cards from my local store and the cheapest that claims 8k support is the Gigabyte RX 6400.

Is a Gigabyte RX 6400 Eagle 4G a good video card for mostly text output at 8k resolution? I might do things like play Netflix in 1/4 of the screen and have text in the other 3/4. Definitely nothing at all challenging in terms of video. AMD drivers have a history of being reliable, but will I face some issues like lack of HDMI support for 8k?

I've watched a YouTube video about trying this on Windows and they got frame rates as low as 4 FPS for games which is not a concern for me. It definitely works OK with Windows driving the card. Will I be likely to have issues running the same hardware on Linux?

I have a T630 that has started powering off after a random amount of time, usually less than 12 hours. When it powers off the backlight of the front panel LCD goes off as do all lights on the case, and iDRAC also doesn't work. So it looks like there's a problem in the power. Dell support seem to have run out of ideas, presumably because they don't want to suggest that I replace parts and they know I'm not going to pay Dell support.

I suspect it could be a faulty Power Backplane board J14R7 0J14R7, how would I test for that?

I have a monitor with multiple modes which include "standard" (good for most things) and "movie". I want to conveniently switch modes when I change programs. Ideally giving keyboard focus to mpv or similar programs would switch the video mode to movie and taking keyboard focus away would switch it to standard.

Is there a way to do this in KDE Wayland? I looked at the "Window Rules" section in the settings but that doesn't seem to support such things. I googled it and there are some viable answers for X11 (like have a script that detects window focus and does what I want) but xdotool etc don't run on Wayland.