First of all I want to congratulate you for the great work with BATOCERA, it's incredible.
I am having the following problem:
I'm using the Batocera 5.8 X64, in INTEL NUC 6i5SYH, by default its video resolution is 4k (3840x2160), everything works perfectly when I connect via HDMI to a FULL HD (1920x1080) TV.
But when I connect it to a 4K TV, I can usually navigate between systems and choose games, but when I open any menu screen, the screen turns black.
And I would like to know how I can set the O.S. BATOCERA to keep resolution at 1920x1080 regardless of whether the TV is 4K or FULL HD.
I'm trying something with the xrandr commands --output HDMI1 --mode 1920x1080, in the xinitrc file.
But I do not know if this is the right path.
Can you help me ?