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.