13

Is there a way to adjust the brightness of the official touchscreen display? I couldn't find a definite answer. I'm running the latest release of Raspbian Jessie.

20

The driver for the screen provides an interface through /sys/. To turn the screen on you can use the command:

echo 0 > /sys/class/backlight/rpi_backlight/bl_power

and to turn it off:

echo 1 > /sys/class/backlight/rpi_backlight/bl_power

the brightness can be adjusted using:

echo n > /sys/class/backlight/rpi_backlight/brightness

where n is some value between 0 and 255.

6

I've made a Python package for this: github.com/linusg/rpi-backlight. Now you don't need to implement this yourself anymore.

Example

(GIF is outdated and API changed just a little, sorry... Below example is correct 🙂)

Works basicly like the above, example:

>>> import rpi_backlight as bl
>>> bl.set_brightness(255)
>>> bl.set_brightness(20, smooth=True, duration=3)
>>> bl.get_max_brightness()
255
>>> bl.get_actual_brightness()
20
>>> bl.get_power()
True
>>> bl.set_power(False)

It has a GUI, a CLI and a simple API :)

protected by Community Aug 24 '16 at 20:55

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