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docs: troubleshooting improve touch info

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alfrix 2023-10-18 12:45:04 -03:00
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docs/Troubleshooting/Touch_issues.md
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@ -62,58 +62,63 @@ DISPLAY=:0 xinput set-prop "<device name>" 'Coordinate Transformation Matrix' <m
Where the matrix can be one of the following options:
| Rotation | Matrix |
| ------------------------------------- | --------------------- |
| 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` |
| expand to twice the size horizontally | `0.5 0 0 0 1 0 0 0 1` |
| Rotation | Matrix |
|-----------------------------------------|-----------------------|
| 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` |
| expand to twice the size horizontally | `0.5 0 0 0 1 0 0 0 1` |
For more in-depth guidance on using Coordinate Transformation Matrices:
* [Ubuntu wiki InputCoordinateTransformation](https://wiki.ubuntu.com/X/InputCoordinateTransformation)
* [Libinput docs](https://wayland.freedesktop.org/libinput/doc/1.9.0/absolute_axes.html)
It has been reported that the touch expands with screens that don't use HDMI. This is due to the composite output,
which enables automatically as a fallback when no HDMI device is plugged in.
If this is the case, adding `enable_tvout=0` to `/boot/config.txt` and reboot.
To make this **permanent**, modify `/etc/udev/rules.d/51-touchscreen.rules`:
```bash
sudo nano /etc/udev/rules.d/51-touchscreen.rules
```
```sh title="51-touchscreen.rules"
ACTION=="add", ATTRS{name}=="<device name>", ENV{LIBINPUT_CALIBRATION_MATRIX}="<matrix>"
```
Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
!!! example
Test:
```sh
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`:
Permanent modification:
```bash
sudo nano /etc/udev/rules.d/51-touchscreen.rules
```
and add following line
```sh
ACTION=="add", ATTRS{name}=="<device name>", ENV{LIBINPUT_CALIBRATION_MATRIX}="<matrix>"
```sh title="51-touchscreen.rules"
ACTION=="add", ATTRS{name}=="ADS7846 Touchscreen", ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1 0 0 1"
```
Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
---
!!! example "Alternative"
As an alternative **if the above doesn't work**:
edit `/usr/share/X11/xorg.conf.d/40-libinput.conf`
```bash
sudo nano /usr/share/X11/xorg.conf.d/40-libinput.conf
```
With the following contents:
```sh
```sh title="40-libinput.conf"
Section "InputClass"
Identifier "libinput touchscreen catchall"
MatchIsTouchscreen "on"
@ -123,3 +128,26 @@ If this is the case, adding `enable_tvout=0` to `/boot/config.txt` and reboot.
EndSection
```
Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
## Touch is expanded:
This can be due to other framebuffers being active, for example the composite output of Raspberries
may be enabled automatically as a fallback when no HDMI device is plugged in.
If this is the case:
Open `/boot/config.txt` for editing:
```sh
sudo nano /boot/config.txt
```
add at the bottom (in the `[all]` section)
```sh title="config.txt"
enable_tvout=0
max_frambefubbers=1
```
Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
**Reboot** to apply changes.