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[Jonathan Boler <1308105@xxxxxxxxxxxxxxxxxx>]

I also installed
http://ftp.uk.debian.org/debian/pool/main/x/xfce4-settings/xfce4-settings_4.12.1-1_amd64.deb
but my 2nd monitor doesn't come back on after it's entered power-save
mode when I move the mouse which does turn my primary laptop display
back on.

No combination of xrandr commands or switching to the console with CTRL-
ALT-F1 brings it back on. The only thing that works is to power cycle
the monitor which causes the display setup to switch back to single
display mode. Then I have to go re-configure the dual display setup
which is really annoying because I have to move all my windows back to
their correct positions on the 2 displays.

I've tested my external monitor on windows and it always comes back on
immediately even after entering the same power save mode so it's not an
issue with the monitor.

Interestingly when I use the displayport over USB-C pass through it all
works correctly. It's only with HDMI that the problem occurs.

I'm using a Dell Precision 5510 laptop with Intel Graphics enabled and
the nvidia graphics disabled on Xubuntu 16.04.1 with all updates
applied. I've also tested this with the same results on Ubuntu 16.10
with all updates applied.

xrandr shows it's still sending the signal to the external HDMI display
even though the display is still in power saving mode:

tenpin: ~ xrandr 
Screen 0: minimum 8 x 8, current 1920 x 2160, maximum 32767 x 32767
eDP1 connected 1920x1080+0+1080 (normal left inverted right x axis y axis) 346mm x 194mm
   1920x1080     59.93*+  59.93  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      60.00  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1368x768      60.00  
   1360x768      59.80    59.96  
   1152x864      60.00  
   1280x720      60.00  
   1024x768      60.00  
   1024x576      60.00  
   960x540       60.00  
   800x600       60.32    56.25  
   864x486       60.00  
   640x480       59.94  
   720x405       60.00  
   640x360       60.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x576i      50.00  
   720x480       60.00    59.94  
   720x480i      60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

-- 
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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