If you are running Wayland, run `sudo apt install iio-sensor-proxy`, and reboot. Your screen as well as the touch input should autorotate.

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However, if you are running X.Org (e.g. running XFCE/MATE), you'll painfully discover that changing the screen orientation in the MATE/XFCE settings does not change the touchscreen input orientation. For example, if you invert your screen, and touch the top-right corner, it will register a touch event in the bottom-left corner.

In this case, you will have to install the Screen Orientation Manager app.

This method works in all DEs I have tested (GNOME/KDE/Cinnamon/XFCE/MATE/LXDE) and should work everywhere. Written in Python, it works on both ARM and x86_64 computers.

First, add the Velvet OS repo

Note. newer images already come with the repo configured

#add public key curl -sS https://repo.velvet-os.org/repo/velvet_repo.asc | sudo tee -a /etc/apt/trusted.gpg.d/velvet_repo.asc #add source echo "deb [arch=arm64,all] https://repo.velvet-os.org/repo stable main" | sudo tee /etc/apt/sources.list.d/velvet_repo.list

Then, run

sudo apt update sudo apt install screen-orientation-manager

Alternatively you can download and install the prebuilt .deb package from GitHub releases.

Run `xinput list` to get the ID for the touchscreen (it may be `hid-over-i2c something:something` or `Elan Touchscreen` or something else) and touchpad (it may be `Elan Touchpad` or something similar). Enter them into the app (it will remember them afterward) and click on the "Lock Touchscreen and Touchpad ID to save" checkmark.

Finally, add the `Screen Orientation Manager` app to the list of startup programs.