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This page will have common problems and common solutions to those problems.

First Steps

The first step to troubleshooting any problem is getting the cause of the error.

  • Check for the file /tmp/KlipperScreen.log

look at the contents by running cat /tmp/KlipperScreen.log or grab the file over WinSCP or another sftp program. This is the most important file, and should be provided if you ask for support.

If that file is non-existent, run journalctl -xe -u KlipperScreen

Check the file /var/log/Xorg.0.log where you can find issues with the X server.

Cannot open virtual Console

If you see this line in the logs:

xf86OpenConsole: Cannot open virtual console 2 (Permission denied)

  • Run cat /etc/X11/Xwrapper.config

This should have the line allowed_users=anybody in it

  • Run cat /etc/group | grep tty

If your username is not listed under that line, you need to add it with the following command:

usermod -a -G tty pi
(if your username is not 'pi' change 'pi' to your username)

You may also need:

sudo apt install xserver-xorg-legacy

Restart KlipperScreen:

sudo service KlipperScreen restart

If it's still failing as a last resort add needs_root_rights=yes to /etc/X11/Xwrapper.config:

sudo echo needs_root_rights=yes>>/etc/X11/Xwrapper.config

restart KS.

Screen shows console instead of KlipperScreen

If you have multiple framebuffers, you may need to fix the X11 configuration, list the available framebuffers and check the current one:

ls /dev/fb*
cat /usr/share/X11/xorg.conf.d/99-fbturbo.conf | grep /dev/fb

If you more than one, try changing it:

sudo nano /usr/share/X11/xorg.conf.d/99-fbturbo.conf

for example: change /dev/fb0 to /dev/fb1

Once you have saved that file, restart KlipperScreen.

sudo service KlipperScreen restart

If you have multiple hdmi ports try the other one

Screen is all white or blank or no signal

If the screen never shows the console even during startup, Then it's tipically an improperly installed screen, follow the manufacturer instructions on how to physically connect the screen and install the proper drivers.

The screen starts flashing colors or stays all blue/white or shows 'No signal' when idle

In KliperScreen settings find 'Screen DPMS' and turn it off. Your screen doesn't seem to support turning off via software, the best you can do is to turn it all black.

Touch not working on debian Bullseye

Some dsi screens have issues where touch doesn't work with debian bullseye, the current fix (at least until upstream is fixed) consist in changing the driver:

Run raspi-config > go to Advanced > GL Driver > select G2 and reboot.

config

Or:

manually edit /boot/config.txt and change:

dtoverlay=vc4-kms-v3d

to:

dtoverlay=vc4-fkms-v3d
and reboot, that should make the touch work, if your screen is rotated 180 degrees, then you may need to adjust the touch rotation as described in the Hardware page.

OctoPrint

KlipperScreen was never intended to be used with OctoPrint, and there is no support for it.

Other issues

If you found an issue not listed here, or can't make it work, please provide all the log files a description of your hw, and a description of the issue when asking for support.

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