# echo 100 > /sys/class/backlight/intel_backlight/brightness
This sets the backlight brightness. I'm not sure what the units are, but it can go all the way to 0. If I shine a very bright light at the screen (like sunlight), it is readable at 0.https://www.indiegogo.com/projects/paperlike-world-s-first-e...
However, it's only 13.3" in size and, as you noted, it is limited by the refresh rate of e-ink.
https://github.com/koreader/koreader uses Lua so maybe one could add some bidirectional or at least PC->Reader flow of data.
edit: VNC! https://www.joachim-breitner.de/blog/660-Using_my_Kobo_eBook...