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[Alexander Schmidt <voidcastr@xxxxxxxxx>]

With the current git-master (xfce4-settings
8adbd2e2463f5cc46c7ed94c0acf264155476268) and NO patches the issue does
not occur for me. That is, neither when powering my HDMI-connected
screen off and on again nor when physically disconnecting and
reconnecting it.

However, I cannot even reproduce the original issue anymore. Weird!

My current configuration:
Xubuntu 14.04 x64
Kernel 3.13.0-45-generic
Intel Core i5-4590S
Intel driver 2.99.911-0intel1
Monitor attached with a HDMI-to-HDMI cable

Things that indeed changed:
- new, different mainboard (the old one died some weeks ago due to a power supply voltage peak)
- new but identical CPU (died due to the same reason)
- upgraded packages from the official Xubuntu 14.04 sources (got no related PPAs or such, so it's just regular updates)
- new kernel version (probably does not matter)

Btw, my machine is not a laptop, so I'm down to 0 outputs when
physically disconnecting my screen (I kind of remember this being
relevant in the source code).

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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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