External Monitor with AMDGPU as source and NVIDIA sink

[amonobeax]

Hi all,
I took a look at a few similar threads that tried using external monitors with the integrated GPU (AMDGPU):

Unable to Setup External Monitor on Manjaro KDE (AMD/NVIDIA)

Hello, I’ve been having a difficult time trying to setup an external monitor on my new gaming laptop with Manjaro KDE. I’ve tried a few things: I’ve tried just normally setting it up through the KDE Display Configuration settings. It detects the external monitor, but when I enable it and click “apply”, it has no effect. If I then close the settings app and reopen it, the enabled checkbox for the external monitor is unchecked. I tried using Arandr to configure it, but each time I enable the sec…

No HDMI output signal on AMD/NVIDIA hybrid laptop

Hello togehter, I got a new Asus TUF laptop, which comes with a Ryzen 7 3750h CPU and a GTX1650 GPU. I’m unable to get an external monitor to work. (e. g. a working monitor or a TV) Xrndr recognize the external hdmi device: ~ >>> xrandr Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384 eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 382mm x 215mm 1920x1080 120.00*+ 4…

It seems the 470 NVIDIA driver documentation no longer states that it’s impossible to output AMDgpu rendering through NVIDIA. Instead the documentation describes a “Reverse PRIME” method with the option Option "AllowPRIMEDisplayOffloadSink" "boolean" (source).

That said it also says this behaviour should be default since xorg 1.20 (I guess we’re using 1.21).

Has anybody actually tested this config as described?

Advice on how to deal with driver options in the Optimus-manager set up is also welcome!
It seems that /etc/optimus-manager/xorg is generating the conf files at /etc/X11/xorg.conf.d/10-ptimus-manager.conf

So probably this “Reverse PRIME” should be set at the /etc/optimus-manager/xorg/integrated-mode

EDIT: just to clarify: I’m able to use the external monitor with the NVIDIA as source (optimus-manager --switch nvidia), but I’d like to use AMDGPU as source instead (for power saving)