Be aware that if ${HOME} is mounted over NFS and that doesn't allow
root the 'usual' arbitrary access to files then GDM will fail to fully
access ~/.Xauthority and fallback to the /tmp/.gdm<random> file.  This
is because for some such accesses it uses uid/gid 0, despite the fact
that it does switch to the user's uid/gid for initial filechecks and
creation of ~/.Xauthority if needed.

  It might be a bug that it uses uid/gid 0 for that later access given
if it is root it should be able to switch to the user again as needed,
and it does indeed switch for the initial checks/creation.

  For now I'm going to investigate why my NFS mounts aren't allowing
arbitrary root access so I can get back to ~/.Xauthority.

-Ath
-- 
- Athanasius = Athanasius(at)miggy.org / http://www.miggy.org/
                  Finger athan(at)fysh.org for PGP key
           "And it's me who is my enemy. Me who beats me up.
Me who makes the monsters. Me who strips my confidence." Paula Cole - ME

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