Screen mirror / clone on a projector?

MNT Pocket Reform
1

I want to mirror my internal display on the external HDMI port. On GNOME, settings reports “compositor doesn’t support wlr-output-management-instable-v1” and I can’t find a good explanation of the monitor.xml file format - if that is what needs to be changed.
Using Wayfire I have this in my wayfire.ini:

[output:HDMI-A-1]
mode = mirror DSI-1
transform = normal

But this leads to the wrong resolution on the HDMI port (640x480 ?) and the picture is 90 degree rotated.
I assume that someone has a working configuration because I am essentially just trying to show my desktop on a projector. So has anyone a working config? Or am I doing something wrong?

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Which CPU module do you have?

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I did not have much luck with mirroring. I have a 1280x800 projector, as well as a 1920x1080. I was not able to convince the external and built-in screens to work at the same resolution. (even with the internal set to 1.5(?) so that the scaling brought it to 1280x800.

I’ll await a reply if someone else has had better luck.

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4

I have the RK3588 CPU module with 32GB.

5

I’m running the old imx8…