No desktop when connected to dGPU

[Timalex]

Installed with Intel iGPU. Was unable to use nomodeset workaround for newer cards since the EFI menu freezes if pressing any other button than enter to select "Solus 3 Budgie" on the USB flash drive.
Just a thought:
Maybe the Solus ISO should have intermittent updates just to have a working display on install.

After a clean install and a fully updated system:
Still no picture when connecting monitor to dGPU (PCI:1:0:0), even on boot.
Identifies dual dGPU:s as SLI. Sets the other dGPU (PCI:7:0:0) as Boot VGA according to linux-driver-management status.
Expected it to use the active and only connected DVI monitor output, instead of the other dGPU (PCI:7:0:0) with a HDMI cable not connected to any monitor.

Workaround
Install nvidia-glx-driver-current
Same result but /etc/X11/00-ldm.conf is available as a template to modify.
Just adding BusID “PCI:1:0:0” of the desired dGPU enables the desktop to start on the next boot.

Also linux-driver-management status still prints PCI:7:0:0 as Boot VGA: yes