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docs: update touch section

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alfrix 2024-02-29 08:35:15 -03:00
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docs/Troubleshooting/Touch_issues.md
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# Touchscreen issues
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).
Contents:
## Touch not working on RaspberryOS and derivatives
* [Touch not working](#touch-not-working)
* [Touch rotation and matrix](#touch-rotation-and-matrix)
* [Touch calibration](#touch-calibration)
Some DSI screens have issues where touch doesn't work with the default configuration.
The current workaround/temporary fix involves changing the kernel driver module used for these displays.
Beware that this document focuses on RaspberryOS but most of it should apply to any other Debian based distros
Open `/boot/config.txt` for editing using `sudo nano /boot/config.txt` and change
## Touch not working
```sh
dtoverlay=vc4-kms-v3d
```
If the screen is connected over USB, the cable may cause issues.
For that, please see [this guide](Physical_Install.md#cable-issues).
to
```sh
dtoverlay=vc4-fkms-v3d
```
??? abstract "DSI screens touch not working on RaspberryOS / MainsailOS version Debian 11 Bullseye"
Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
Some DSI screens have issues where touch doesn't work with the default configuration.
The current workaround/temporary fix involves changing the kernel driver module used for these displays.
`sudo nano /boot/config.txt` and change
```sh
dtoverlay=vc4-kms-v3d
```
to
```sh
dtoverlay=vc4-fkms-v3d
```
**Reboot** to apply changes.
If that doesn't fix it, you can try commenting these lines out, resulting in:
```sh
# dtoverlay=vc4-kms-v3d
# max_framebuffers=2
```
**Reboot** to apply changes.
Close the nano editor using `ctrl`+`x` (exit), then `y` for yes (save).
**Reboot** to apply changes. `sudo reboot`
If that doesn't fix it, you can try commenting these lines out, resulting in:
```sh
# dtoverlay=vc4-kms-v3d
# max_framebuffers=2
```
**Reboot** to apply changes. `sudo reboot`
## Touch rotation and matrix