Programs to display information to LCD framebuffer

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Totally true

Just wanted to be able to get the time when having no available wireless, aside of this I am thinking about shutting down lcd backlight when no input detected for some time, emulationstation really miss options to execute script when entering/quitting screen saver.

Edit: I understood the way to use npn transistor but I only have C1815 on hand, when applying 5v+1kohm to base, it drain almost 5mAh (around 40x more than leaving voltage divider as is) :/

I think that the https://github.com/juj/fbcp-ili9341/ driver has some detection for sleep mode.  You could maybe look at that and see if there's a good way to detect inactivity.  I know that I sent him a backlight brightness controller to test with, but I actually never heard if he worked on that or not yet.

I'll see if there's any suggestion for the mosfet idea.  It's not my area of expertise, but my colleague is good with that stuff.