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User requests that the T-Deck keyboard backlight automatically turn off when the device screen sleeps due to inactivity. The backlight should resume its previous state when the screen becomes active again, improving power efficiency and user experience.
### Platform ESP32 ### Description The T-Deck keyboard has a backlight which can be manually toggled, but I think it would make sense to automatically turn off the backlight when the device is inactive long enough for the screen to turn off, and then have it automatically resume whatever state it was in when the screen becomes active again.