Translations:Xorg/Guide/132/en
From Gentoo Wiki
To run Xorg with non-root users, as root, either enable a logind provider (see Non root Xorg) or set the suid USE flag (see above note).
Wiki
To run Xorg with non-root users, as root, either enable a logind provider (see Non root Xorg) or set the suid USE flag (see above note).