That card has DisplayPort 1.4 which means that if HDMI doesn’t work then it’s limited to HBR3 which gives 24bpp@31Hz, which is barely adequate.
Also how do you set the bpp rates? The DisplayPort wikipedia page says that 24bpp and 30bpp are supported, but how do I even know which is in use?
The TV has built in NetFlix and YouTube so I don’t have much need for playing video from Linux. Currently YouTube is the only source of 8K video that I’m aware of.
I know it’s low end, I just don’t want to spend much money. It seems likely that one way or another I’ll find some problem with whatever card I get and want to replace it in a couple of years so I don’t want to spend much.
The card is documented as having HDMI 2.1.
MAXSUN Intel Arc B580 Milestone 12G Graphics Card (MS-ARC-B580-MILESTONE-12G
The above is the cheapest card from my local store that has DisplayPort 2.1 (the rest have 1.4). It’s $469 compared to $199 for a RX 6400 or RX 6500. I can probably find somewhere cheaper to buy these things but I’m working on the assumption that the ratios of prices are going to be about the same.
From the Wikipedia page it looks like DSC is needed to do 8K@60Hz on DisplayPort 1.4. I think that is bad for text though.