Setup: Troubleshooting

Whitescreen

This indicates your driver is not working, please consult your touchscreen maker for installation instructions.

X11 is using the wrong framebuffer for displaying TouchUI.

Run sudo nano /etc/X11/xorg.conf.d/99-fbdev.conf
if file/path does not exist then create it
Find the following code:
```
Section "Device"  
  Identifier "touchscreen"
  Driver "fbdev"
  Option "fbdev" "/dev/fb1"
EndSection
```
if not found, paste the code into the file
if found, replace /dev/fb1 into /dev/fb0 or /dev/fb0 into /dev/fb1
Save & Exit (CTR-O, ENTER, CTR-X)
Run sudo chmod +x /etc/X11/xorg.conf.d/99-fbdev.conf
Reboot

Make sure you followed the Calibration part first!
Edit the calibration file you made sudo nano /etc/X11/xorg.conf.d/99-calibration.conf
Add the following line before the EndSection that you copied from the calibration:

For inverting horizontal axis
```
Option "InvertX" "true"
```
For inverting vertical axis
```
Option "InvertY" "true"
```

Download and install the plugin SnapStream (also available in the plugin manager)
Configurate the settings:
1. Open a browser and type http://pi-ip-adrress:8080/?action=snapshot.
  If this works, then replace /webcam/?action=snapshot with /?action=snapshot and save
2. If that didn't work, then try http://pi-ip-adrress:8080/webcam/?action=snapshot
  In that case, SnapStream should work straight out of the box

Please consult your touchscreen maker for better details. These steps below work on a Waveshare 3.5

Stop TouchUI with sudo service touchui stop
Run curl -sLS https://apt.adafruit.com/add | sudo bash
Run sudo apt-get install -y xinput-calibrator
Run sudo xinit ~/TouchUI-autostart/calibration.xinit*
Follow the calibration steps
After you completed step 6, pay attention to your command line, because it will show a wall of text with at the bottom instructions, please copy Section until Endsection and follow step 7
Exit by pressing CTR-C
Run sudo nano /etc/X11/xorg.conf.d/99-calibration.conf and replace the file with the copied Section code from step 6.
Save (CTR-O, Enter, CTR-X)
Reboot

* if the file does not exist, update your bootloader!.

Update your bootloader!.
Read the instructions from https://wiki.ubuntu.com/X/InputCoordinateTransformation
Run sudo apt-get install xinput
To get your device name run FRAMEBUFFER=/dev/fb1 & DISPLAY=:0.0 xinput list
use /dev/fb0 if you're using HDMI or the Official RPI display
Create a new file touch ~/TouchUI-autostart/calibration.sh
Edit the new file nano ~/TouchUI-autostart/calibration.sh
Copy su $TOUCHUI_USER -c "xinput set-prop 'YOUR DEVICE NAME' 'Coordinate Transformation Matrix' 0 1 0 -1 0 1 0 0 1"
Replace 'YOUR DEVICE NAME' and the coordinates with the instructions from the ubuntu wiki.
Save & Exit (CTR-O, ENTER, CTR-X)
Reboot