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docs: Touchscreen rotation configuration

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Jordan 2021-06-20 20:27:07 -04:00
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docs/Installation.md
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@ -69,3 +69,40 @@ Find the ID of your display and put it in the following command:
```
DISPLAY=:0 xinput_calibrator -v --device <id from last command>
```
#### 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. You can have the matrix be one of the following:
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°: `-1 0 1 0 -1 1 0 0 1`
To check the current matrix, you will need your `<screen name>` (which can be found via the last section, ex:
"wch.cn USB2IIC_CTP_CONTROL"). Run the following command:
`xinput list-props "wch.cn USB2IIC_CTP_CONTROL"`
It will output something such as:
```
Device '<screen name>':
Device Enabled (115): 1
Coordinate Transformation Matrix (116): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Calibration Matrix (247): -1.000000, 0.000000, 1.000000, 0.000000, -1.000000, 1.000000, 0.000000, 0.000000, 1.000000
libinput Calibration Matrix Default (248): -1.000000, 0.000000, 1.000000, 0.000000, -1.000000, 1.000000, 0.000000, 0.000000, 1.000000
libinput Send Events Modes Available (249): 1, 0
libinput Send Events Mode Enabled (250): 0, 0
libinput Send Events Mode Enabled Default (251): 0, 0
Device Node (252): "/dev/input/event0"
Device Product ID (253): 6790, 58083
```
You can verify by checking that the 'Coordinate Transformation Matrix' or 'libinput Calibration Matrix'.
You can test a change by running:
`xinput set-props "<screen name>" 'Coordinate Transformation Matrix' <matrix>`
Replace matrix with one of the options above, such as: `1 0 0 0 1 0 0 0 1`
To make this permanent, modify the file `/etc/udev/rules.d/51-touchscreen.rules` and put the following line in:
```
ACTION=="add", ATTRS{name}=="<screen name>", ENV{LIBINPUT_CALIBRATION_MATRIX}="<matrix>"
```