Hi!
I honestly have no idea why the root.img does do this… I even have trouble to understand how it is possible.
Currently I am on OpenOS, so I can’t test. Can someone confirm this behavior:
- Fresh 1.5.1 = no problem with minimal light
- Flash rooted boot.img = minimal light leeds to black screen
Edit: actually this bug was already here: Brightness can be turned to zero with FPOS 1.3.6 and supposed to be fixed :-/