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[Aaron Whitehouse <1308105@xxxxxxxxxxxxxxxxxx>]

I have an ASUS Z170M-Plus Mobo with an Intel Core i3-6100T, Intel HD 530
graphics and a Samsung TV connected through HDMI, running Mythbuntu
16.04.

I had the issue that when I turned the TV off and then back on again, the TV would say "No Signal" and I would have to run 
$ sudo service lightdm restart
to get it to work again.

Based on Alexandre's comment #128, I installed xfce-settings 4.12.1 from here:
https://packages.debian.org/stretch/amd64/xfce4-settings/download
http://ftp.uk.debian.org/debian/pool/main/x/xfce4-settings/xfce4-settings_4.12.1-1_amd64.deb
and installed it on my Mythbuntu 16.04 installation. To my surprise, I didn't have any dependency issues, it all applied without problems and now the problem seems fixed! I can turn the TV off and on again and the picture comes back as expected.

Great work all in getting this sorted.

-- 
You received this bug notification because you are a member of UBUNTU -
AL - BR, which is subscribed to Mythbuntu.
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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