Turning off the TFT screen on the OGST or Cloudshell cases

[Zaphod]

The TFT screen on the OGST is very bright (especially at night) so I wanted to be able to turn it off since my gameing box is in the bedroom.

Here are the commands to do just that:

#Turn the backlight ON
echo 0 > /sys/class/backlight/fb_ili9340/bl_power

#Turn the backlight OFF
echo 1 > /sys/class/backlight/fb_ili9340/bl_power

I have written a script that does this for you.

#!/bin/bash

filename='/sys/class/backlight/fb_ili9340/bl_power'
read -r state<$filename

if [ "$state" = "0" ]; then
        echo 1 > /sys/class/backlight/fb_ili9340/bl_power
else
        echo 0 > /sys/class/backlight/fb_ili9340/bl_power
fi

to use the script do the following.

Log in to your recalbox via SSH
then use these commands

cd
nano backlight
#copy paste the script into this new document
ctrl+x then y #this will exit and save the document
chmod +x backlight #make the script executable

To use the script simply type ./backlight to toggle the TFT backlight on and off

I am hoping backlight control can be built in to the next version.

FOR DEVELOPERS

This is the command to turn off all backlights if you want to include a universal backlight control in the next version

# Turn off backlight
echo 1 | tee /sys/class/backlight/*/bl_power

# Turn on backlight
echo 0 | tee /sys/class/backlight/*/bl_power

[Zaphod]

A slightly better version of the script that accepts 'on' and 'off' arguments. If no argument is given it toggles the backlight state

#!/bin/bash

filename='/sys/class/backlight/fb_ili9340/bl_power'
read -r state<$filename

if [ "$1" = "off" ]; then
        echo 1 > /sys/class/backlight/fb_ili9340/bl_power
elif [ "$1" = "on" ]; then
        echo 0 > /sys/class/backlight/fb_ili9340/bl_power
else
        echo "This command accepts the following arguments"
        echo "on - turns the backlight on"
        echo "off - turns the backlight off"
        echo "If no argument is given the backlight will toggle"
        echo "No state selcted, toggling."
        if [ "$state" = "0" ]; then
                echo 1 > /sys/class/backlight/fb_ili9340/bl_power
        else
                echo 0 > /sys/class/backlight/fb_ili9340/bl_power
        fi
fi

[paradadf]

@Zaphod hi and thank you for your script! I‘d suggest you to please open an issue on gitlab and add your script there with the explanation. Gitlab is the platform for development and just having it here, although useful for the community, has the risk of getting forgotten.

[ian57]

@Zaphod @paradadf this feature is already included in the next release of RB. See https://gitlab.com/recalbox/recalbox/-/blob/master/board/recalbox/fsoverlay/recalbox/scripts/miniTFTSupport.sh line 163

[Zaphod]

@ian57 I guess great minds think alike. I do have a suggestion for that script but I will make it in gitlab