Authentication Failed 1/21

I assume that you installed the xpadneo-dkms package from the AUR. If so, then the version you have on your system seems to be out-of-date:

Note the v0.9.7. According to AUR (en) - xpadneo-dkms, the package in the AUR is now v0.9.8. Pamac confirms this:

pamac info xpadneo-dkms 
Name                  : xpadneo-dkms
Version               : 0.9.8-1
Description           : Advanced Linux Driver for Xbox One Wireless Gamepad
URL                   : https://github.com/atar-axis/xpadneo
Licenses              : GPL-3.0-or-later
Repository            : AUR
Groups                : --
Depends On            : dkms bluez bluez-utils
Optional Dependencies : --
Make Dependencies     : --
Check Dependencies    : --
Provides              : --
Replaces              : --
Conflicts With        : --
Maintainer            : marmis
First Submitted       : Tue 14 Jul 2020 02:03:33
Last Modified         : Sun 11 Jan 2026 13:35:34
Votes                 : 37
Out of Date           : --

A hotfix for linux618 compatibility is included in that updated package, which fixes this bug:

So, try rebuilding the package so that the new version is installed (I’m not sure if you will have to boot into an older kernel first to do this):

pamac build xpadneo-dkms

After the xpadneo-dkms rebuild has completed, reinstall the linux618 kernel using the same mhwd-kernel command that you used earlier.

Note that AUR packages often/usually require rebuilding after an update to ensure they will work with the system’s new or updated libraries/packages.

Further reading: