Udev: Failed to write to /sys/class/input/mice/uevent Check that you have permission to access input devices on Raspberry Pi

The «Udev: Failed to write to /sys/class/input/mice/uevent – Check that you have permission to access input devices» occurs when you execute a JavaFX application on a Raspberry Pi using a «normal» user (not root).

The underlying problem is the use that JavaFX do with the device hardware: it requires ‘write’ access to them directly.

To avoid the problem just execute your command using «sudo» or -better- modify the system settings to grant write access to the devices all users that belongs to the «input» group.

To do so just edit the 99-com.rules file:

sudo nano /etc/udev/rules.d/99-com.rules

And paste this script at the bottom of the file:

SUBSYSTEM=="input*", PROGRAM="/bin/sh -c '\
 chown -R root:input /sys/class/input/*/ && chmod -R 770 /sys/class/input/*/;\
'"

Press control+X and save the changes.

Enjoy!

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