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[Andy Wood <ahwood@xxxxxxxxxx>]

Reproducible on HP Pavilion SE a6655f, AMD x64, with Asus brand Geforce GT-220 (ENGT220) video card, only connected output is HDMI to surround receiver, then HDMI to Panasonic LED TV.
Unused workaround from comment #22 (disable xfsettingfsd) and has been solid since. I switched inputs on the TV away from the surround to a digital cable box, watched a little TV, then back without issue. I turned off TV and surround, turned back on, and I can still see the output from the HP. 

Mythbuntu 14.0.4 LTS (fresh install of 14.04.4 actually).

A side-effect was that sometimes the mouse pointer would also disappear
if I switched away and back again. I'll be watching that problem closely
on this HP PC now that I've worked around the current problem.

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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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