To Control the backlight of the Raspberry Pi 7-inch touchscreen display
Using command line
Turn Off
echo 1 | sudo tee /sys/class/backlight/rpi_backlight/bl_powerTurn On
echo 0 | sudo tee /sys/class/backlight/rpi_backlight/bl_powerSet Brightness
https://github.com/raspberrypi/linux/commit/e9c356a2c18787d356567f24e7879875d7337efc
From Windows IoT
Seems hit and miss at the moment. Some users report it can be done via the display PCB’s 5 pin connector I2C pins, other users report its buggy, can cause touch to stop working and also causes problem with other I2C devices on the same bus. Also there’s no official documentation. A better way it seems is via a GPU mailbox interface feature but as yet we’ve not come across a simple implementation.
https://www.raspberrypi.org/forums/viewtopic.php?t=152495
To Control the backlight of HDMI displays
Using command line
Turn Off
vcgencmd display_power 0Turn On
vcgencmd display_power 1
USEFUL?
We benefit hugely from resources on the web so we decided we should try and give back some of our knowledge and resources to the community by opening up many of our company’s internal notes and libraries through mini sites like this. We hope you find the site helpful.
Please feel free to comment if you can add help to this page or point out issues and solutions you have found, but please note that we do not provide support on this site. If you need help with a problem please use one of the many online forums.