Trying Kazabubu's suggestion to extend GdmXserverTimeout cleared it up
for me. At least it's been fine for the last week plus, I've rebooted
many times.

Okay, here's my hypothesis of what's going on:

1) Note that Rami said boot was slow for him until he turned off AHCI,
and then when he disabled it boot sped up and the problem disappeared.
The AHCI-slowing-boot thing sounds like some weird BIOS/kernel
interaction, but note: auto login didn't work when boot was slow.

2) The system I'm experiencing this on has a very, very slow old hard
drive (5400 rpm 1/3 height 40 gigger from like 7 years ago), so boot is
always slow.

3) I'd noticed that when this problem happens, X would start coming up,
then it would go away, the system would go back to the console, X would
start up again and get to the gdm login screen. Like I would expect to
happen if the gdm script was timing out, killing X, and starting it
again. It probably didn't time out a second time because the system was
no longer as busy with processes starting up in the background.

So the next thing would be to look at the code and see if gdm still
honors the AutomaticLogin after having timed out once. If not, there's
the bug, and it's going to be more relevant as efforts to parallelize
the boot process continue.

Steve

-- 
Jaunty's GDM Autologin doesn't work anymore
https://bugs.launchpad.net/bugs/370541
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