PiTop Ceed V1 - Pi4 + Pi OS Bullseye Distorted Display Fix

With a Pi4 and Bullseye version of Pi OS (Version 2021-10-30-raspios-bullseye-armhf-full.img) I found that the V1 Ceed display is distorted:

In case its helpful for others, this is what fixed the issue for me:

a) The Pi4 has two HDMI sockets. First ensure the PiTop HDMI connection is plugged into the HDMI socket nearest the USB C connector.

b) Add the following to the /boot/config.txt file:

hdmi_group=2
hdmi_cvt=1366 768 60
hdmi_mode=87

c) Then create or edit /etc/X11/xorg.conf to be as follows:

Section "Monitor"
    Identifier "Ceed"
    Modeline   "Ceed" 70.12 1368 1414 1446 1498 768 772 776 780 +hsync -vsync
    Option "PreferredMode" "Ceed"
EndSection 
Section "Screen"
    Identifier "Ceed"
    Device "HDMI-1"
    Monitor "Ceed"
EndSection 

d) Reboot (sudo reboot) and the display is fixed

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