Deviceinfo dev touchscreen

This page is about deviceinfo_dev_touchscreen from the deviceinfo file.

How to find the touchscreen device name?

Note: The deviceinfo_dev_touchscreen property is mostly obsolete - DirectFB can now automatically detect the touchscreen. This works only if the touchscreen sets the INPUT_PROP_DIRECT bit to identify the input device as a touchscreen. Setting the property is only necessary if your touchscreen is not automatically detected.

Initramfs #1 (fastest)

• Connect to your initramfs via telnet
• Run ls /dev/input
• For each device in there, do the following:
  • Run cat /dev/input/$device
  • Tap on the screen and see if you get any output
  • The device where you get output is the touch screen

Initramfs #2

• Connect to your initramfs via telnet
• Run ls /dev/input
• Try out one after another:
  • Change deviceinfo_dev_touchscreen in your deviceinfo
  • Rebuild the deviceinfo package, initramfs and flash:

 pmbootstrap checksum device-wiki-example
 pmbootstrap build --force device-wiki-example
 pmbootstrap initfs # rebuild initramfs
 pmbootstrap flasher boot_kernel

Easy method (you don't need to connect)

• Turn on your device and open any file manager, for example, Total Commander
• Go to /dev/input directory
• For each device in there, try to remove it one by one.
• When the touch screen stops working, it means that the device you just deleted is the touch screen.
• To fix the touch screen, reboot the device.

Flashing system + libinput list-devices

Alternatively, run pmbootstrap install and flash the system partition again. Then you can use the program libinput list-devices to get the list of devices - with probably more useful names.

When you have the right device name, put it into your deviceinfo (as outlined above), then re-flash the encrypted system image. It should work now.