spacorn,
Your gpu was probably released after this version of the driver. We'd need a new CRT Emudriver based on a newer AMD driver in order to support it.
At the moment I can't give any probable date for this to happen.
Just wanted to post that we're a number of people who would greatly appreciate it if it happens, having the main PC for this purpose is nice, both from a CPU viewpoint (being able to utilizie the best most modern CPU you own for MAME) and just from a convenience point of view as many keep our 15kHz CRT's near our desks anyway.
Have a friend try get their dual GPU (modern nvidia GPU+HD5450) setup working with win11, which worked perfectly with vulkan and flawless CRTswitchres in win10. But despite my recommendation on ignoring win11, they decided to upgrade anway and ended up with the rejected by driver issue. Which is how I found out about the whole DX11 compatibility clash.
Personally I disabled unsuspecting win11 upgrades in every way I can.
All the work you've put into this is greatly appreciated either way, can't imagine a world with CRT's but without CRTEmudriver!
Unrelated to the above:
Been helping people set all of this up through discord a lot, as I threw together some guide PDF's for this setup:
Hardware needed+CRTemudriver install+guide and presets for RA CRTSwitchres+gui alternatives (all on the CRT, or optionally game browsing on an LCD) and that sort of thing, very roughly put together but I'm easily available anyway.
So anyone who needs help, just hit me up and I'll gladly help getting the setup up and running, both emulation and windows native games that support 15kHz resolutions, have a bunch of those setup with batch+ahk scripts for perfect output set at game launch, no stutters or screen tearing at all. 4x internal resolutions for 3D systems at 2560 super res output (yes it makes a difference
https://imgur.com/a/2eVfjla last pic is 4x internal) vulkan allowing for main GPU processing, outputting to the HD5450 while the CRT is set as main display for switchres. With no lag or a <16ms subframe lag cost (240 fps highspeed cam test showing perfect syncronization between CRT and modern monitor).
More than happy to share how any of this is done.