![]() That works because the redirect is executed as sudo, but there is the unintended side-effect of 1 output text. You'll learn a bit going down this rabbit hole.įYI this also worked: $ echo 1 | sudo tee /sys/class/backlight/rpi_backlight/bl_power ![]() There are downsides to this, and you may need to run your Python script as sudo (not a good idea, generally) or make configuration changes to your Pi. More reading (and doing this in "pure" Python): ![]() You'll see this in some cron files, or used heavily by the Docker community. If there is already code in here (from configuring your raspberry pi to automatically open in full screen) add this code under the xscreensaver -no-splash line, press the Enter key and add these 3 lines. If this file is empty, simply add the 3 lines of code below. ![]() The "-c" option is often used to "wrap" commands into a user context, like sudo. Set Xscreensaver to Autolaunch after Reboot. That's fine in most cases, but not in this one. If you read Subprocess documentation, it may contain suggestions to not use it to run shell scripts. If you are doing this in a web application (and therefore rightly concerned about security), then avoid use of variables around these calls (hardcode the Python subprocess calls), and get the code peer-reviewed.Use the "command syntax" to run the script files, and the script's own shell should take care of things. then you can use Python subprocess() to invoke these new scripts. First save the above as backlight_off.sh and backlight_on.sh (with proper #!/bin/sh shebang header), maybe saved to /usr/local/bin/ if you want it available in your $PATH.Be sure to save that file elsewhere, since you'll lose it if you re-image. Note - in previous versions of Ubuntu you could have used a screensaver called glslideshow - however this doesnt appear to work in 11.10. Code: Select all sudo apt-get update apt-cache search xscreensaver It has been my custom to use Xeyes Gar圜N Posts: 4 Joined: Tue 6:25 am Re: Xscreensaver - install extra screensavers Thu 3:59 pm To get the extra ones that may be greyed out this worked for me. TIP: I define the above as backlight_off and backlight_on in ~/.bash_aliases. 3 Answers Sorted by: 18 You need to specify in the advanced options of xscreensaver-demo the folder that contains your photos. ON: sudo -E sh -c 'echo 0 > /sys/class/backlight/rpi_backlight/bl_power' In the update of 12 April, work for around 15 minutes but, after this time, the finger touch on the screen is not able to switch on the screen.OFF: sudo -E sh -c 'echo 1 > /sys/class/backlight/rpi_backlight/bl_power' the LEDs moving all the time (so are working) but the touch screen dies in black). I have 5 Raspberry Pi 3B since years working, four with the official Raspberry Pi screen with this problem and one with a small 3.5" touch screen, with other drive and working perfectly in the screen on/off issue). until i left to touch the screen and then. After trying out various methods found form a Google search, here is the final way I setup my Raspberry Pi to display an image-based screensaver indefinitely on startup. I have done the reset to all the Rasp, updates all the times and now I can see they are working as always. I verify in Raspberry Pi config and is active. Hello world, since the update of Raspbian, in February the screen not sleep. ![]()
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