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[John R <h_ubuntu@xxxxxxxxx>]

Hey guys - a little help for  a relative Ubuntu n00b?

I'm *not* running Mythbuntu - I'm running standard Ubuntu Desktop 14.04.
I don't have xfce4-settings installed, but I am seeing very similar
behaviour to that described in this bug report. I have a DisplayPort
monitor attached. If I switch it off and switch it on again (or switch
it to a different input and back again), Ubuntu doesn't detect the
monitor and it says black. I have to reboot the box to get the display
back. (There may be a way of getting it back using ssh but I haven't
been able to do that yet).

If I change the monitor cable from DisplayPort to DVI this does not
happen. I'm using a GTX660 with an HP LP2475w.

My behaviour looks like the same bug, but changing xfce4-settings won't
help as I don't have it installed!

Can anyone verify this behaviour, and if verified, add the appropriate
data in the "Affects" field? Thanks.

-- 
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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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