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[pqwoerituytrueiwoq <1308105@xxxxxxxxxxxxxxxxxx>]

I have been having this issue on my 14.04 install for a while now (probably as long as Mario), i have been using my rPi and a button to run a command over ssh to fix it 
DISPLAY=":0.0" xrandr --output HDMI-0 --auto

i upgraded me and my dad to xfce 4.12 and now he has the issue ga-a55m-ds2 motherboard and a AMD A6-3500 APU
he is running xubuntu 14.04 w/ linux 3.16.7 w/ xfce 4.12 (open source drivers, NOT fglrx/catalyst)
he is using DVI on a HP 2009M monitor
this command restores the display for him
DISPLAY=":0.0" xrandr --output DVI-0 --auto
he seems to have this issue wen the power manager turns the display off and the monitor goes into standby

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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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