New comment by dm17 on void-packages repository https://github.com/void-linux/void-packages/issues/43786#issuecomment-1548999115 Comment: Fixed! The clue was two other programs I wasn't using that had the same inverted colors issue (regardless of fullscreen or not, in videos, no matter what driver or output method was used) - vlc and mplayer. After hitting my head on the table a few times, I figured I had 100% stock X11 configuration, but I found one setting was changed: `DefaultDepth`! So 10-bit color is generally broken on very standard hardware/software configurations in X11! Anyway, that's a bit of context if anyone gets stuck looking for the cause. `DefaultDepth 24` (8-bit) fixes this.