Note: This method is only applicable to systems with linux 5.4 kernel.

There are two variables fb0_width and fb0_height in the /boot/orangepiEnv.txt of the linux system, which can be used to set the width and height of the Framebuffer. The default setting of the linux system is fb0_width=1920 and fb0_height= 1080.

orangepi@orangepi:~$ sudo vim /boot/orangepiEnv.txt
verbosity= 1
console=both
disp_mode= 1080p60
fb0_width=1920
fb0_height=1080

The reference values corresponding to different resolutions of fb0_width and fb0_height are as follows:

HDMI resolution | fb0_width | fb0_height