@Feartech
-cdfon didn't change the available resolutions, I think I'm going to research how a bios unlock works on my model, to increase DVMT. Is there any difference between increasing DVMT in BIOS vs. increasing it using fb-patches?
Also, I tried to narrow down where the errors occurred after unplugging the cable, where my screen stays black (but still has backlight on). Attached it, maybe you can spot something familiar in there, I will also keep on investigating that. First line of file is hotplug remove event. There are some errors in there too.