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["Mark A. Taff" <mark@xxxxxxxxxxxx>]

Also, this was happening in 15.04 as well, so it isn't likely to be
caused by the upgrade to 15.10.

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https://bugs.launchpad.net/bugs/1522174

Title:
  No signal from X Server after turn TV off then back on

Status in xorg-server package in Ubuntu:
  New

Bug description:
  Hardware:
    Intel NUC NUC5i5RYK,  Intel HD Graphics 6000, core i5
    LG TV, model 47LA6200-UA

  Bug is reproducible on demand.

  I have the box connected to the TV via HDMI.

  Steps to reproduce:
  1) Turn on TV
  2) Boot into Linux, log into KDE
  3) Turn TV off, leave computer running
  4) Turn TV back on
  5) TV reports no signal for input

  At state #5, cannot get the signal back by:
  a) shaking mouse,
  b) pressing keyboard keys
  c) unplugging, then reconnecting, HDMI cable

  At state #5:
    --login via ssh from remote computer works
    --top shows all processes running as typical for KDE
    --able to start x11vnc via ssh from remote machine, then connect to display :0 using KRDC as a client; KDE still works fine
    --I can get the signal back by killing X form a local tty, or remotely vis ssh, in which case X will restart and I will get the signal back until the next time I turn off the TV, though that requires me to relogin to KDE and start from scratch as the session isn't saved when you kill X that way.

  Workaround (seems to work, at least for cases when TV is off for a few minutes):
    --Before shutting of TV, switch to tty1 (Ctrl+Alt+F1)
    --Shut off TV
    --Turn TV on when you next want to use it
    --tty1 will show up, switch to tty7 (vt7), and it works as expected.
    --on the prior step a console message is printed:
            [timestamp] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!

  The same message also repeats upon HDMI cable disconnect/reconnect.

  I'm currently using the latest Intel drivers from
  https://01.org/linuxgraphics but the issue also presents with default
  kubuntu drivers.

  I suspect the issue has to do with the HDMI handshake not being
  renewed/restarted when the TV comes back on. Even when in state #5,
  the TV detects when the HDMI cable is unplugged ("No cable connected"
  vs "No signal from input").

  Let me know if you need any additional information or if I can do
  anything to help with debugging.

  Thanks!

  --Mark

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Wed Dec  2 16:20:43 2015
  ExecutablePath: /usr/bin/Xorg
  InstallationDate: Installed on 2015-09-04 (89 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  SourcePackage: xorg-server
  UpgradeStatus: Upgraded to wily on 2015-12-01 (1 days ago)

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