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[Luuk van der Duim <1308105@xxxxxxxxxxxxxxxxxx>]

On Linux Mint 18 xfce, I too got bitten by this bug.
After power off / power on, the monitor reports 'no signal'.

Intel Integrated Q45/Q43 Graphics (Dell Optiplex 780 USFF)
DisplayPort <--> DVI-D cable
Acer V243HL LCD Monitor (1920x1080 @60Hz)


I applied 'Enable crtc if it is disabled after power cycle' patch as provided in comment #53 by jkampe68 to the source package of xfce4-settings (4.12.0-2ubuntu1)

This fixed the issue. Thank you jkampe68.

I sincerely hope this patch or an adaptation that fixes the problem
accordingly will find its way into the xfce4-repository.

Thanks in advance!

    Luuk

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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:
  Fix Released
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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