Sure. The embedded display is LVDS.
There is a DP output, but i don't plan to use it.
However, and depending on the options set in config.plist, I have a second screen on a Acer G245H (24 inches 1080p).
When using Big Sur, this Acer shows 1080p, while the LVDS has only 1280x1024 (and sometimes, 1024x768).
But now I'm with Monterey again, there are no 1080p on both of the screens.
Of course, the EFI aren't exactly the same between BS & M, and I can't find where the difference is.
Maybe it's in the MacOS itself, I don't know. :/
Wait...do you think this is useful ?
https://github.com/dortania/OpenCore-Install-Guide/blob/master/config.plist/ivy-bridge.md
Note : I almost forgot...this AIO has a MXM port, but it's empty. I'm pretty sure there was no card in here, as the computer came from an university.
And in the bios, there is nothing about "reserved graphics memory" or whatever.