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On 2014-08-25T13:45:10+00:00 Mario Limonciello wrote:

In xfsettingsd 4.11.2 there appears to be a regression that when a TV
hooked up to the computer via HDMI gets power cycled, it stops
displaying anything.

It happens via a RANDR event being sent to all X clients when the TV
gets turned off.

xfsettingsd thinks that it should switch to an internal output, but
desktops don't have one.  So when the TV comes back on the bus it seems
like it's an extra monitor and xfsettingsd gets confused.

xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 447.
xfce4-settings(displays): Detected CRTC 448.
xfce4-settings(displays): Noutput: before = 1, after = 0.
xfce4-settings(displays): Output disconnected: HDMI-0
xfce4-settings(displays): Disabling CRTC 447.
xfce4-settings(displays): No active output anymore! Attempting to re-enable the internal output.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 447.
xfce4-settings(displays): Detected CRTC 448.
xfce4-settings(displays): Noutput: before = 0, after = 0.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 447.
xfce4-settings(displays): Detected CRTC 448.
xfce4-settings(displays): Detected output 452 HDMI-0.
xfce4-settings(displays): Noutput: before = 0, after = 1.
xfce4-settings(displays): New output connected: HDMI-0


Additional details can be found on the Ubuntu bug report located here:
https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1308105

Reply at: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-
drivers-331/+bug/1308105/comments/30


** Changed in: xfce4-settings
       Status: Unknown => Confirmed

** Changed in: xfce4-settings
   Importance: Unknown => Medium

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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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