12.04 and just hit this now when plugging in my Vizio TV in via HD. Cleared out 
my monitor.xml to get around it.
When I plug in,  my laptop monitor always goes black then both screens turn on. 
Sounds like it's something where the monitor configuration util is not getting 
the 'turning them back on' part when it loads the config. Probably stalling to 
show some message or something but since you have no display at the time you 
never see it.

If anyone can recommend some logs to gather or what I ought to attach a
gdb to if I can repro the issue,please let me know. I have a backup of
my bad monitor.xml.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/926637

Title:
  Xorg crashes to black screen when attaching HDMI Samsung monitor to
  laptop

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/926637/+subscriptions

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