How to get display output on secondary GPU (non primary)

[DS_DV]

Ive never got it to work but after i switched to a APU/iGPU setup i saw this post (:
Maybe it helps someone in the future <3

@BuzzBumbleBee

Mutter / Gnome On non boot gpu

One thing i added was a udev rule to force mutter (gnome and gdm to run on the IGP / 2nd display adapter), for this i created /usr/lib/udev/rules.d/61-mutter-primary-gpu.rules with the following rule

ENV{DEVNAME}=="/dev/dri/card1", TAG+="mutter-device-preferred-primary"