Ink Dim

Ink Dim: tap to set the frontlight of a Viwoods AiPaper reader below the lowest system level. Tap again to go back.

Why the app needs Shizuku The system will not set the frontlight below its own floor. Ask for less through any official route and the light snaps to zero. So the app writes the light of the panel straight, at /sys/class/leds/lcd-backlight/brightness.

That file belongs to the user system. An app cannot write it, and a plain shell user cannot write it either. The AiPaper Reader that this was made on has a userdebug build, where the shell user may run su 0. On a reader with another build, the app says that it could not set the light. So the app asks Shizuku for a shell, and the shell writes the file through su 0.

Shizuku is a separate free app. You start it from the device through wireless debugging. There is no computer and no root.

Long press the icon and open Settings for the steps, with a button for each one.