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[Chuck McManis <chuck.mcmanis@xxxxxxxxx>]

Ok I have confirmed that the patch in #115 (Saved the Patch by jkampe68
(http://bug-attachment.xfce.org/attachment.cgi?id=6590) as .patch file.)
fixes the issue on NUC derived systems (Intel graphics, I've got a
NUC5i7RYH and a Gigabyte BRIX) where the screen attached to the display
port output does not come back on when power is re-applied to the
monitor. The next step is validating that the screen can recover after a
"sleep state" which has been initiated by light-lock.

I pulled the git repo applied the patch, ran autogen.sh then make, then
make install. Rebooted and verified the new settingsd was running (

cmcmanis@charliehorse:~$ xfsettingsd --version
xfsettingsd 4.12.0git-56abfbd (Xfce 4.12)

Copyright (c) 2008-2011
	The Xfce development team. All rights reserved.

Please report bugs to <http://bugzilla.xfce.org/>.
cmcmanis@charliehorse:~$ 

Power cycled the monitor, and where previously this would always cause
it to not come back, it now returns. System is Xubuntu 16.04 otherwise
vanilla install.

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https://bugs.launchpad.net/bugs/1308105

Title:
  Xfce resets TV mode to NULL when power cycled

Status in Mythbuntu:
  Confirmed
Status in xfce4-settings:
  Confirmed
Status in nvidia-graphics-drivers package in Ubuntu:
  Invalid
Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Invalid
Status in xfce4-settings package in Ubuntu:
  Confirmed

Bug description:
  I had an HTPC with Mythbuntu 12.04 installed.  Upon upgrading a new
  behavior that if the TV is power cycled it no longer detects a link
  with the HTPC.

  When this happens I can find in the xorg log that there is an
  accompanying log item:

  [ 39829.509] (II) NVIDIA(0): Setting mode "NULL"

  After debugging with NVIDIA at
  https://devtalk.nvidia.com/default/topic/729955/linux/tv-stops-being-
  detected/ we've deteremined it's a X client that reacts to the RANDR
  events causing the mode to be set to NULL.

  Working through the list in an Xfce environment, the culprit is
  xfsettingsd.  If xfsettingsd is running, it causes the TV to come up
  in a NULL mode.  If it's killed, it remains in the mode it was
  previously running in.

  
  Until this is fixed, this behavior can be worked around with a simple shell script:
  ==============================
  #!/bin/sh
  #Fix TV state when HDMI link is lost.
  #By Mario Limonciello <superm1@xxxxxxxxxx>

  OUTPUT="HDMI-0"
  BAD_MODE="1280x720"
  GOOD_MODE="1920x1080"

  for MODE in $BAD_MODE $GOOD_MODE; do
   DISPLAY=:0 xrandr --output $OUTPUT --mode $MODE
   sleep 2
  done
  ==============================

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