Great question — answering as the UphillTech team:
Yes, you can change the virtual console resolution with fbset and set it to anything up to the resolution of the larger screen. The other screen will then only show the upper left area of the entire virtual console, and I do not know of any way to disable that. No side effects on X11 once you switch back to the VT it runs on. E.g. to set all console VTs to 2560x1440, run the following in any one console VT: fbset -a -xres 2560 -yres 1440
Full answer by Daniel: https://unix.stackexchange.com/a/184879 (CC BY-SA 3.0).
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