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Change framebuffer resolution on boot like the Ubuntu Live CD does

br flag

I have a fairly recent machine using a Ryzen 5 and a GTX 1060.

When I boot from a Live Ubuntu USB (20.04.3), the initial framebuffer resolution is very crude, most probably 640x480. But after some seconds, long before Xorg starts, it switches to a very high resolution, I guess it is my native screen resolution of 3840x2160. I tried reproducing this effect on my main system (Debian testing) using fbset, but I don't get anything above 1280x1024x32. The same goes for changing the resolution in /etc/default/grub, which also maxes out at 1280x1024x32.

How can I get a framebuffer console with 3840x2160? How does the live cd change the framebuffer resolution?

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