The systemd unit xboxdrv.service doesn't use the XBOXDRV_OPTS variable from /etc/conf.d/xboxdrv. I attached an edited xboxdrv.service that fixes this.
Created attachment 404922 [details] xboxdrv.service
/etc/conf.d files shouldn't be used as explained at: https://wiki.gentoo.org/wiki/Project:Systemd/conf.d_files
(In reply to Pacho Ramos from comment #2) > /etc/conf.d files shouldn't be used as explained at: > https://wiki.gentoo.org/wiki/Project:Systemd/conf.d_files Exactly.