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[Ivan Kozik <ivan@xxxxxxxxxx>]

I have a Viewsonic VX2475Smhl-4K attached with a DisplayPort cable to a
Gigabyte GTX 970 (nvidia-358 driver, ASUS Z97-A, UEFI boot with CSM
disabled), and it requires `xrandr --auto` after being power cycled.
That's easy to set to a keyboard shortcut when logged in, but harder in
xflock4.  Even less amusing, Linux text VTs don't work until an `xrandr
--auto` in an X session.

There were reports that non-VESA-compliant DisplayPort cables that wire
pin 20 (DP_PWR) cause this problem, but I checked my Cable Matters cable
with a multimeter and it does not wire pin 20.

Microsoft has a page about this problem: https://support.microsoft.com
/en-us/kb/2625567

-- 
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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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