On Wed, 27 May 2020, George N. White III wrote:
https://www.systutorials.com/configuration-of-linux-kernel-video-mode/ has an incantation (from 2015) to display available video modes.
Got it. vbeinfo notices several resolutions at at least two resolutions each: 1920 x 1440 at 8 or 16 bits 1600 x 1200, 1280 x 1024, 1024 x 768 and 640 x 480 at 8, 16 or 32 bits It claims that 1440 x 900 is the preferred mode, but gives no mode number. Note that the first three modes are larger than 1140 x 900.