Error 43 with both 442.59 and 460.89 on Qubes 4.0.3 with Xen 4.8.5 and Windows 10 Pro 20H2/19042

[fahrstuhl]

I tried patching Nvidia drivers 442.59 and 460.89 to use my GTX 1060 6GB on Qubes 4.0.3 with Xen 4.8.5 but I sadly still get error 43.

The script for patching and signing went through without errors (after I fixed it up for newer versions of the Windows SDK). The driver is signed by SKSoftware:

The GPU is attached to the Windows VM with permissive and no-strict-reset, although enabling or disabling these does not make a difference for me:

dom0:01_00.0   VGA compatible controller: NVIDIA Corporation GP106 [GeForce GTX 1060 6GB]    Windows-Qube (permissive=True, no-strict-reset=True)
dom0:01_00.1   Audio device: NVIDIA Corporation GP106 High Definition Audio Controller       Windows-Qube (permissive=True, no-strict-reset=True)

Nouveau is blacklisted and the PCIe devices are hidden with the following in the kernel commandline: rd.qubes.hide_pci=01:00.0,01:00.1

Any ideas? (Apart from buying an AMD card, which I would do if they were available…)