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[Launchpad Bug Tracker <1308105@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: nvidia-graphics-drivers (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1308105

Title:
  HDMI Handshake fails after TV powered off

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New
Status in “nvidia-graphics-drivers” package in Ubuntu:
  Confirmed
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Confirmed

Bug description:
  I had an HTPC with Mythbuntu 12.04 installed and all included NVIDIA
  185 driver package.  Connected to the HTPC is an audio receiver and
  from the audio receiver a TV.

  I had no problems on NVIDIA 185.

  Since upgrading to 14.04 I have tried both the 304.117 driver as well
  as the 331.38 driver.  Both have a new behavior that if the TV is
  power cycled it no longer detects a link.

  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"

  Upon recommendations from the internet i've captured the EDID, tried
  to hardcode the metamodes in the xorg conf, and regenerated the xorg
  conf using nvxconfig to no avail.  The problem persists.

  Here is my original functional xorg.conf from 12.04 w/ NVIDIA 185:
  ==============================
  Section "Screen"
  	Identifier	"Default Screen"
  	DefaultDepth	24
  EndSection

  Section "Device"
  	Identifier	"Default Device"
  	Driver	"nvidia"
  	Option	"DPI"	"100x100"
  	Option	"NoLogo"	"1"
  EndSection

  Section "Extensions"
  	Option "Composite" "Disable"
  EndSection
  ==============================

  Here is the xorg conf I've cluttered all the workarounds on the internet that still doesn't fix the problem:
  ==============================
  Section "Monitor"
      # HorizSync source: edid, VertRefresh source: edid
      Identifier     "Monitor0"
      VendorName     "Unknown"
      ModelName      "SONY AVAMP"
      HorizSync       31.0 - 82.0
      VertRefresh     57.0 - 63.0
      Option         "DPMS"
  EndSection

  Section "Device"
      Identifier     "Device0"
      Driver         "nvidia"
      VendorName     "NVIDIA Corporation"
      BoardName      "GeForce 9500 GT"
          Option  "DPI"   "100x100"
          Option  "NoLogo"        "1"
          Option  "ConnectedMonitor" "DFP-1"
          Option  "CustomEDID" "DFP-1:/etc/X11/edid.bin"
          Option  "UseEDID" "True"
  EndSection

  Section "Screen"
      Identifier     "Screen0"
      Device         "Device0"
      Monitor        "Monitor0"
      DefaultDepth    24
      Option         "Stereo" "0"
      Option         "metamodes" "1920x1080 +0+0"
      Option         "SLI" "Off"
      Option         "MultiGPU" "Off"
      Option         "BaseMosaic" "off"
      SubSection     "Display"
          Depth       24
      EndSubSection
  EndSection

  Section "Extensions"
          Option "Composite" "Disable"
  EndSection
  ==============================

  I have discovered that 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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