Support altering the brightness?

[llakssz]

Seeing as many people boot the homebrew launcher from menuhax and in turn avoid the 3ds home menu, it would be very useful to have the ability to alter the screen brightness.
Just like we can alter it from DS mode on the 3ds (because we can't access home menu mid DS game), and (most?) DS flashcarts had this feature too.

Thanks

Modifying the brightness from arm11 code was kind of glitchy for me. The home menu seems to persistently keep the brightness the way it was set before.
https://raw.githubusercontent.com/44670/3ds_backlight/master/source/main.c

BTW that was for ntr cfw ^

[profi200]

The gsp::Lcd service should provide ways to adjust brightness correctly but they are not documented yet.

[yellows8]

Anything with gsp::Lcd should only be temporary.