I have an older PC I am setting up as a emulation PC. I set the resolution to 1920x1080, 60Hz. However, when I connect it to a 4K monitor, it ignores that setting, and runs at 3840x2160, and there is a significant drop in frame rate.
Both retroarch.cfg as well as the core cfg contain the lines
video_fullscreen = “true” video_fullscreen_x = 1920 video_fullscreen_y = 1080
How do I make it enforce these options… and NOT revert to 4K resolution when starting a game?