How do I prevent the screen from going blank?

  • I am running the Debian wheezy beta and using my Pi to display my geckoboard dashboards using midori, as a result I want to prevent the screen from going blank, which it does after 10 minutes (though it doesn't seem to turn off the backlight). I have searched through the menu options and can not find how to prevent this. I came across a post on raspberrypi.org suggesting that the following:

    sudo sh -c "TERM=linux setterm -blank 0 >/dev/tty0"
    

    would solve the problem, but it does not work. I have also tried changing BLANK_TIME to zero in /etc/kbd/config without success.

  • Jivings

    Jivings Correct answer

    8 years ago

    This is an X power-saving thing.

    Firstly, you may need to install xset, a lightweight application that controls some X settings.

    apt-get install x11-xserver-utils
    

    Now open up your ~/.xinitrc file (if you don't have one then create it) and enter this:

    xset s off         # don't activate screensaver
    xset -dpms         # disable DPMS (Energy Star) features.
    xset s noblank     # don't blank the video device
    
    exec /etc/alternatives/x-session-manager      # start lxde
    

    This file runs once every time X starts and should solve the problem. I copy and pasted it from my own .xinitrc and can confirm that my screen does not blank.

    @SteveRobillard `apt-get install x11-xserver-utils`

    Which account should the .xinitrc be created for? The pi account (which auto-logs in) or the root account (which owns the x-server)?

    I created it for the pi account and it works OK! Thank you all.

    what does `exec /etc/alternatives/x-session-manager` do? When I take it out the bar at the bottom is gone. I'm curious about how it all fits together. A brief explanation would be appreciated.

    @Scoop It just starts `lxde` with session management. This allows you to boot up with applications from your previous session still running. If you remove it `lxde` will start from a blank slate, which is why there is no toolbar (it's not been started).

    Modifying: `/etc/xdg/lxsession/LXDE/autostart` as described here and modifying `~/.xinitrc` + `/etc/kbd/config` as described from `cwd` did not get me any further. My screen still gets black with backlight.

    Can confirm this **does not work** on the Pi 3

    This certainly didn't work on my Raspberry PI 2 Model B running Raspbian Jessie.

    This doesn't work in the Debian Jessie (8) that I run with parallels VM in a MacBook Pro.

    Just wanted to say that this worked for me on Pi 3 with the Lite image of Raspbian and `nodm` as the display manager. Only difference is that in my case the commands had to be put in the `~/.xsession`. I think the reason this solution doesn't appear to work for most people is related to `lightdm` specifically which is what most use.

  • The other solutions here did not work for me (fresh Raspbian, boot to GUI). Instead, this worked:

    1. Open up /etc/lightdm/lightdm.conf using your favorite text editor (I prefer nano).
    2. Look for the line #xserver-command=X. Change it to xserver-command=X -s 0 dpms
      • It should be at line 87 if things don't change.
    3. Save and reboot.

    Source

    This DID work on my Raspberry PI 2 Model B running Raspbian Jessie.

    This worked for me on Pi3 with Jessie

    I'm trying to understand these options. `-s 0` sets the screen timeout to 0 minutes, which I assume makes it 'never'. (Is this different from `-s off`?) Why `dpms`, though, not `-dpms`? Don't I want to _disable_ display power management services?

    @TheGuywithTheHat Have you tried this solution with `-dpms`? Please report back and maybe we can infer what's going on.

    @pandalion98 Testing it right now with `dpms`, `-dpms`, and neither. Will report back soon.

    I realized I'm not on a Pi here, so I don't know how general this is. That being said, `-s 0` appears to be all that's necessary on my system. Neither `dpms` nor `-dpms` appeared to have any effect.

    This also worked for me on my Raspberry Pi 3. Line number to change though was 91 now.

    Using `-dpms` disables DPMS, while `+dpms` enables it. Using just `dpms` also enables it, in practice, though "man xset" says it can be followed by up to three numbers (to set standby/suspend/off timeouts), or other options such as "force on" or "suspend". See "man xset" for details. FYI, with a Pi 3 and a Raspbian lite (Stretch/9.4) install to which I then added the GUI stuff, this answer worked for me, when using `-dpms`.

  • I think @Jivings answer may be better, but I have it in my notes to do this:

    • Install apt-get install x11-xserver-utils

    • Edit /etc/xdg/lxsession/LXDE/autostart

    Append these lines:

    @xset s noblank
    @xset s off
    @xset -dpms
    

    Possibly also comment out the line that says @xscreensaver -no-splash, so the complete file should look something like this:

    @lxpanel --profile LXDE
    @pcmanfm --desktop --profile LXDE
    # @xscreensaver -no-splash
    
    @xset s noblank
    @xset s off
    @xset -dpms
    

    Also edit /etc/kbd/config and make sure these values are set as follows (however I believe this is only for when the lightweight desktop (LXDE) is not running (i.e. the pi is still in text / terminal mode):

    BLANK_TIME=0
    BLANK_DPMS=off
    POWERDOWN_TIME=0
    

    I believe that the /etc/xdg/lxsession/LXDE/autostart may be the sort of system-wide version of ~/.xinitrc but someone else probably knows the nuances better.

    Edits to /etc/kbd/config solved the problem for me.

    I applied all the changes mentioned in this answer. This certainly didn't work on my Raspberry PI 2 Model B running Raspbian Jessie.

    I think there has been some change with profiles by default, the autostart you need to edit might be `~/.config/lxprofile/LXDE-pi/autostart`.

    my rpi 2 on raspbian jessie needed the above edits to `~/.config/lxsession/LXDE-pi/autostart` as jason points out below

  • To prevent the screen from going blank try adding consoleblank=0 to the end of the first line of /boot/cmdline.txt

    Source

    Please don't post duplicate answers for duplicate questions.

    It was a very difficult answer to find and figured it applied. Why not vote for this to be a duplicate question instead of commenting?

    I voted for the original question to be marked as duplicate of this one. Keeping either of the answers sounds fine, but I suppose you prefer to have the one that got upvoted.

    I wouldn't want my answer to only be on the duplicate, I would want it on the master of the two - even if I found the other question first. Which is why i suggested you vote instead of comment

    This is the only solution that has worked for my Pi Zero with a monitor but no keyboard, and no X11.

  • What worked for me was editing ~/.config/lxsession/LXDE-pi/autostart and commenting out the screensaver, all the other xset commands didn't seem to affect it when it is started here:

    @lxpanel --profile LXDE-pi
    @pcmanfm --desktop --profile LXDE-pi
    #@xscreensaver -no-splash
    

    You might also need to add one or both of these lines to disable the power management:

    @xset dpms 0 0 0
    @xset -dpms
    

    On the version of Raspbian Jessie I got the utils were already installed.

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Content dated before 6/26/2020 9:53 AM