3.1 KiB
Hardware
There are no recommended screens, but the minimum supported resolution is 480x320
Hardware known to work
Configuration
Follow the manufacturer instructions on how to install your screen. In general if you see a white screen, then it's not properly installed, ensure that you at least see a console, Then 
Touchscreen touch rotation
If your touchscreen isn't registering touches properly after the screen has been rotated, you will need to apply a transformation matrix.
First you will need your device name, on a terminal run:
DISPLAY=:0 xinput
Output:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ADS7846 Touchscreen id=6 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
In this case the device is the ADS7846 Touchscreen, yours may be different
You can test a change by running:
DISPLAY=:0 xinput set-prop "<device name>" 'Coordinate Transformation Matrix' <matrix>
Where the matrix can be one of the following options:
- 0°:
1 0 0 0 1 0 0 0 1 - 90° Clockwise:
0 -1 1 1 0 0 0 0 1 - 90° Counter-Clockwise:
0 1 0 -1 0 1 0 0 1 - 180° (Inverts X and Y):
-1 0 1 0 -1 1 0 0 1 - invert Y:
-1 0 1 1 1 0 0 0 1 - invert X:
-1 0 1 0 1 0 0 0 1
For example:
DISPLAY=:0 xinput set-prop "ADS7846 Touchscreen" 'Coordinate Transformation Matrix' -1 0 1 0 -1 1 0 0 1
To make this permanent, modify the file /etc/udev/rules.d/51-touchscreen.rules and add following line:
ACTION=="add", ATTRS{name}=="<device name>", ENV{LIBINPUT_CALIBRATION_MATRIX}="<matrix>"
More info about input transformation can be found in: