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 PSUs have lights on in the normal manner, they both have green lights when the machine is unresponsive. The power is probably OK, it works well enough for many other systems. The PSUs are configured in a redundant configuration, I’ve tried it running each of the PSUs separately and running both. Tried running both from a Y cable and from separate cables. I’ve tried switching the PSUs between bays. None of this changes it. But all on the same circuit.
There’s nothing in the iDRAC logs related to it or at the same times.
Thanks for the suggestions. I’ll try it on a different circuit but I have to put it back together again.
For people who know as much about technology as most people in this discussion the thing to do if short of cash would be to buy a cheaper phone. I recently got myself a quite decent Note9 for $109AU and I could have got something even cheaper if I needed to. But many people aren’t as well informed, the above article is one example of people who are less well off being scammed by a corporation.
For my home workstation running Debian/Bookworm I started running Wayland-Plasma when Xorg mysteriously refused to work after replacing my video card. Wayland just worked and really had no issues for me so while I’m sure I could have solved the X11 problem I didn’t have a real need to.
I also changed my laptop to Wayland-Plasma more recently. A problem I had was in setting up the right modes for external monitors on laptops but that seems to work OK now. Generally things just work.
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.