Screen/backlight off

[kevsestre]

Is your feature request related to a problem? Please describe.

When playing music, it's probably good if we can turn off the display. As a reference, sysdvr had the feature implemented here https://github.com/exelix11/SysDVR/commit/f1052e38c12f07d84b1a4a6b47e0e0307c363a5f

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

No response