Hello, I own a Tinker Board S (bought one or two years ago) attached to a Sony Bravia KDL 22EX320 TV by HDMI, which has a native resolution of 1388x768 pixels.
Bionic desktop with kernel 5.4 (got from https://dl.armbian.com/tinkerboard/Bionic_current_desktop) didn't properly recognize the TV resolution, but set it to 1920x1024.
If I run
xrandr --props
the resolution is not listed.
I'm posting because I'm almost sure that the old TinkerOS 2.0.8 (that I installed with the board) recognized the TV resolution correctly - it anyway boots to desktop without requiring interaction, so not being able to read the text at the edges of the console is not a big issue - and I just tested that the current 2.1.11 does too: they both start in 1920x1024, but the Monitor settings windows lists 1360x768.
Back to Armbian, I however managed to create the default user and to get to the Bionic desktop; I'd like to add that the display settings window should have a "Test" function that reverts to the previous settings if the new aren't confirmed, because if the chosen resolution isn't supported, the screen stays black.