Romulan
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Romulan got a reaction from TRS-80 in How to change screen console resolution ROCK64 Armbian Ubuntu 18.04?I was able to set screen resolution on OrangePi4 by appending this line:
extraargs=video=1920x1080@60 To /boot/armbianEnv.txt .
On my board the screen is turned on only after a little while after the powering up, so I have figured out that the screen resolution is set by the kernel, not by u-boot. Thus you need to add a parameter to kernel command line.
The line has to be added verbatim without quotes (as suggested elsewhere) and then everything after first = is inserted into the middle of Kernel command line (check dmesg output).
I hope, this helps.