GeneralKlipperScreen/docs/Troubleshooting/Framebuffer.md

Screen is using the wrong framebuffer

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*

!!! example "Output example" pi@raspberrypi ~ $ ls /dev/fb* /dev/fb0 /dev/fb1

!!! failure "Critical" if you only see one, for example /dev/fb0 then this is not the issue. Go to Troubleshooting

Use fbcp to copy from one framebuffer to the other

cd
git clone https://github.com/tasanakorn/rpi-fbcp.git
cd rpi-fbcp
mkdir build
cd build
cmake ..
make
sudo install fbcp /usr/local/bin/fbcp
sudo wget -O /etc/init.d/fbcp https://gist.github.com/notro/eac0fec51cac67bb99c7/raw/4804a36459db10b17d35451d98d4573a045084be/fbcp
sudo chmod +x /etc/init.d/fbcp
sudo update-rc.d fbcp defaults
sudo reboot

Manually change the framebuffer

the file specifying the framebuffer could be:

• 99-fbturbo.conf
• 99-fbusb.conf
• 99-fbdev.conf

check if one of those or similar exist with:

ls /usr/share/X11/xorg.conf.d/

!!! failure "Critical" DO NOT CREATE A FILE, and only edit if there is more than 1 framebuffer

!!! example you found 99-fbdev.conf:

```sh
sudo nano /usr/share/X11/xorg.conf.d/99-fbdev.conf
```
``` title="99-fbturbo.conf"
Section "Device"
        Identifier      "Allwinner A10/A13/A20 FBDEV"
        Driver          "fbdev"
        Option          "fbdev" "/dev/fb0"
        Option          "SwapbuffersWait" "true"
EndSection
```

since `ls /dev/fb*` returned `/dev/fb0 /dev/fb1` change it to `/dev/fb1`

Save the file, restart KlipperScreen.

```sh
sudo service KlipperScreen restart
```