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[Sean Davis <1308105@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- Xfce resets TV mode to NULL when power cycled
+ [SRU] Xfce resets TV mode to NULL when power cycled

** Also affects: nvidia-graphics-drivers (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: xfce4-settings (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers-331 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: xfce4-settings (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers-331 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: nvidia-graphics-drivers (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: nvidia-graphics-drivers (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: nvidia-graphics-drivers-331 (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: nvidia-graphics-drivers-331 (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: xfce4-settings (Ubuntu Bionic)
       Status: New => Fix Released

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

Title:
  [SRU] 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:
  Fix Released
Status in nvidia-graphics-drivers source package in Xenial:
  Invalid
Status in nvidia-graphics-drivers-331 source package in Xenial:
  Invalid
Status in xfce4-settings source package in Xenial:
  New
Status in nvidia-graphics-drivers source package in Bionic:
  Invalid
Status in nvidia-graphics-drivers-331 source package in Bionic:
  Invalid
Status in xfce4-settings source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * When a TV is power-cycled, it is no longer detected as an available display.
   
   * The root issue is in xfce4-settings: xfsettingsd.
   
   * The related patch correctly handles the NULL mode the TV enters when powered off.

  [Test Case]

   * Connect a TV to a computer running xfce4-settings 4.12.0, this can be in a single configuration or dual-monitor.
   
   * Power the TV off.
   
   * Power the TV on.
   
   * Expected: TV powers on and remains connected as an available display.
   
   * Actual: TV powers on and is not connected or detected.

  [Regression Potential]

   * Regression potential is minimal: The associated patch targets this
  very specific scenario and behavior, and does not interact with the
  rest of the codebase.

  [Original Report]
  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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