Waveshare DSI LCD displays

Please try the following:

Stop the Touch Display plugin.

Then execute

sudo bash -c 'cat << EOF >  /etc/X11/xorg.conf.d/99-vc4.conf
Section "OutputClass"
    Identifier "vc4"
    MatchDriver "vc4"
    Driver "modesetting"
    Option "PrimaryGPU" "true"
EndSection
EOF'

Start the Touch Display plugin again.