NanoPC-T4 legacy: enable USB-C DisplayPort & eDP outs
As the name suggests, the fix consists in kernel config and DT changes, in order to enable DP out through USB-C, and eDP, in NanoPC-T4 legacy. It can run dual displays.
I was able to test USB-C DP, but not eDP since I don’t own a screen.
There was some bug when enabling eDP by default, reported here: https://forum.armbian.com/topic/16516-rk3399-legacy-multimedia-framework/?do=findComment&comment=121554
I disabled it and moved it to a overlay, in this commit:
So it should be done now.
This is considered done?
3D acceleration works like a charm in both displays
(The apparent glitch is because when you touch the right edge of the first screen, the windows resizes for an instant to fill the right half)