1b2a6b872c
* Add nano editor commands for file edits This PR adds `sudo nano /path/to/file.ext` as well as closing/saving instructions Adding nano edit commands to the page will improve people's ability to execute these steps. As noted during a Nero3D stream, neither our VzBot docs nor the page we linked to on KlipperScreen explained *how* to edit the file. * Format table
129 lines
4.0 KiB
Markdown
129 lines
4.0 KiB
Markdown
# Touchscreen issues
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If the screen is connected over USB, issues with the cable may cause similar symptoms. For that, please see [this guide](Physical_Install.md#cable-issues).
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## Touch not working
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Some DSI screens have issues where touch doesn't work with Debian Bullseye, or even in Debian Buster after an update. There is currently (September 2023) still no fix in upstream Debian.
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The current workaround/temporary fix involves changing the kernel driver module used for these displays.
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### Fix
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Open `/boot/config.txt` for editing using `sudo nano /boot/config.txt` and change
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```sh
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dtoverlay=vc4-kms-v3d
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```
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to
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```sh
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dtoverlay=vc4-fkms-v3d
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```
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Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
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**Reboot** to apply changes.
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If that doesn't fix it, you can try commenting these lines out, resulting in:
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```sh
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# dtoverlay=vc4-kms-v3d
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# max_framebuffers=2
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```
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**Reboot** to apply changes.
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## Touch rotation and matrix
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If the touch works but registers touch input in a different location from the input, then you may need to apply an input transformation matrix.
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First you will need your device name. On a terminal, run:
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```sh
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DISPLAY=:0 xinput
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```
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Output:
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```text
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⎡ Virtual core pointer id=2 [master pointer (3)]
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⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
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⎜ ↳ ADS7846 Touchscreen id=6 [slave pointer (2)]
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⎣ Virtual core keyboard id=3 [master keyboard (2)]
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↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
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```
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In this case the device is the ADS7846 Touchscreen, yours may be different
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You can test a change by running:
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```sh
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DISPLAY=:0 xinput set-prop "<device name>" 'Coordinate Transformation Matrix' <matrix>
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```
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Where the matrix can be one of the following options:
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| Rotation | Matrix |
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| ------------------------------------- | --------------------- |
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| 0° | `1 0 0 0 1 0 0 0 1` |
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| 90° Clockwise | `0 -1 1 1 0 0 0 0 1` |
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| 90° Counter-Clockwise | `0 1 0 -1 0 1 0 0 1` |
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| 180° (Inverts X and Y) | `-1 0 1 0 -1 1 0 0 1` |
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| invert Y | `-1 0 1 1 1 0 0 0 1` |
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| invert X | `-1 0 1 0 1 0 0 0 1` |
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| expand to twice the size horizontally | `0.5 0 0 0 1 0 0 0 1` |
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For more in-depth guidance on using Coordinate Transformation Matrices:
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* [Ubuntu wiki InputCoordinateTransformation](https://wiki.ubuntu.com/X/InputCoordinateTransformation)
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* [Libinput docs](https://wayland.freedesktop.org/libinput/doc/1.9.0/absolute_axes.html)
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It has been reported that the touch expands with screens that don't use HDMI. This is due to the composite output,
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which enables automatically as a fallback when no HDMI device is plugged in.
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If this is the case, adding `enable_tvout=0` to `/boot/config.txt` and reboot.
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!!! example
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```sh
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DISPLAY=:0 xinput set-prop "ADS7846 Touchscreen" 'Coordinate Transformation Matrix' -1 0 1 0 -1 1 0 0 1
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```
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To make this permanent, modify the file `/etc/udev/rules.d/51-touchscreen.rules`:
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```bash
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sudo nano /etc/udev/rules.d/51-touchscreen.rules
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```
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and add following line
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```sh
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ACTION=="add", ATTRS{name}=="<device name>", ENV{LIBINPUT_CALIBRATION_MATRIX}="<matrix>"
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```
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Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
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---
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As an alternative **if the above doesn't work**:
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edit `/usr/share/X11/xorg.conf.d/40-libinput.conf`
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```bash
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sudo nano /usr/share/X11/xorg.conf.d/40-libinput.conf
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```
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With the following contents:
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```sh
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Section "InputClass"
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Identifier "libinput touchscreen catchall"
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MatchIsTouchscreen "on"
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MatchDevicePath "/dev/input/event*"
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Driver "libinput"
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Option "TransformationMatrix" "0 -1 1 1 0 0 0 0 1"
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EndSection
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```
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Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
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