what(): Error opening device: Permission denied

[Thib1404]

I am using a fresh install of Raspbian GNU/Linux 10 (buster) on a Raspberry Pi 3 B v1.2 and a Xbox One controller 1537 that I am planning to use with Steam link. I have a large wireless dongle. It works fine on Windows 10. I have installed xov successfully and the service is running. Yet, when I try to pair the controller I have the following error displayed with "sudo systemctl status xow" :

● xow.service - Xbox One Wireless Dongle Driver
Loaded: loaded (/lib/systemd/system/xow.service; enabled; vendor preset: enabled)
Active: failed (Result: signal) since Fri 2020-05-01 15:45:08 CEST; 757ms ago
Process: 1840 ExecStart=/usr/local/bin/xow (code=killed, signal=ABRT)
Main PID: 1840 (code=killed, signal=ABRT)

mai 01 15:44:56 raspberrypi xow[1840]: 2020-05-01 15:44:56 INFO - xow v0.4-16-ge54c8fd ©Severin v. W.
mai 01 15:44:56 raspberrypi xow[1840]: 2020-05-01 15:44:56 INFO - Waiting for device...
mai 01 15:44:56 raspberrypi xow[1840]: 2020-05-01 15:44:56 INFO - Wireless address: 62:45:b4:ec:e0:00
mai 01 15:45:04 raspberrypi xow[1840]: 2020-05-01 15:45:04 INFO - Pairing initiated
mai 01 15:45:04 raspberrypi xow[1840]: 2020-05-01 15:45:04 INFO - Pairing initiated
mai 01 15:45:04 raspberrypi xow[1840]: 2020-05-01 15:45:04 INFO - Pairing initiated
mai 01 15:45:08 raspberrypi xow[1840]: terminate called after throwing an instance of 'InputException'
mai 01 15:45:08 raspberrypi xow[1840]: what(): Error opening device: Permission denied
mai 01 15:45:08 raspberrypi systemd[1]: xow.service: Main process exited, code=killed, status=6/ABRT
mai 01 15:45:08 raspberrypi systemd[1]: xow.service: Failed with result 'signal'.

[medusalix]

We've had this issue a couple of times already: Most of the time users didn't reboot after installation or had conflicts with existing udev rules. Please take a look at issues #54 and #23.

[FrandSX]

The conflict with Steam Link udev rules is also noted on the Steam Link Discussions

The solution in #54 fixed the same problem for me.

[Thib1404]

Indeed, thank you for your quick support ! I haven't looked deep enough in the past issues.. The solution #54 worked for me !
In this file /lib/udev/rules.d/56-steamlink.rules

# USB devices
SUBSYSTEM=="usb", GROUP="plugdev"

# HID devices
KERNEL=="hidraw*", GROUP="input", MODE:="0660"

# Creating virtual devices
KERNEL=="uinput", GROUP="input", MODE:="0660"

I changed the MODE to 0666 and it works as expected !