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[Voidcastr <1308105@xxxxxxxxxxxxxxxxxx>]

I just bisected the git repository of xfce/xfce4-settings and identified
the commit that introduced the issue as:

------------------------------------------

dbd76eb58bd9d7a55de753daa5572ef24867d924

Author: Lionel Le Folgoc <lionel@xxxxxxxxxxxx>  2012-11-08 20:15:42
Committer: Simon Steinbeiss <simon.steinbeiss@xxxxxxxxxxxxxxxx>  2012-11-08 20:50:40
Parent: 82ab3a355a4b7eff6cffa57ca5a8e8622feb2d31 (l10n: Updated Portuguese (pt) translation to 100%)
Child:  cf67ba0d283d991c67a4e3df2de758f94cb2f7d2 (l10n: Updated Spanish (Castilian) (es) translation to 99%)
Branches: master, remotes/origin/bluesabre/display-settings, remotes/origin/bluesabre/display-settings2, remotes/origin/master, remotes/origin/ochosi/primary
Follows: xfce4-settings-4.11.0
Precedes: xfce4-settings-4.11.1

    Re-enable the internal display when the external one is disconnected
    
    (and add the possibility to start xfce4-display-settings --minimal when a new
    display is connected)
    
    Signed-off-by: Simon Steinbeiss <simon.steinbeiss@xxxxxxxxxxxxxxxx>

------------------------------------------

Building and using its immediate predecessor fixes the issue for me. Can
anybody confirm?

I am currently investigating the code, trying to find what's wrong.
However, I have little to no experience regarding the code base, so this
might take a while. Any help would be greatly appreciated.

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

Title:
  Xfce resets TV mode to NULL when power cycled

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  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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