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[Nick <1308105@xxxxxxxxxxxxxxxxxx>]

^No AMD owns ATI, the other major graphics card provider.

I am also experiencing this problem on integrated Intel graphics on
Xubuntu 14.04 when using HDMI. It's the first distro I have used on this
system but I never had the problem on Xubuntu 12.04 on my previous sytem
(which was VGA/D-sub).

I do not get 'NULL' in my /var/log/Xorg.0.log but the issue is basically
the same problem. I do get null in dmesg however:

[code][    0.152426] ACPI: SSDT           (null) 0004C4 (v01  PmRef  Cpu0Ist 00003000 INTL 20061109)
[    0.153472] ACPI: SSDT           (null) 000433 (v01  PmRef  Cpu0Cst 00003001 INTL 20061109)
[    0.160066] ACPI: SSDT           (null) 00015F (v01  PmRef    ApIst 00003000 INTL 20061109)
[    0.163743] ACPI: SSDT           (null) 00008D (v01  PmRef    ApCst 00003000 INTL 20061109)[/code]

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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 “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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