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Ubuntu 16.04 (xenial) reached end-of-standard-support on April 29, 2021.

I'm setting the status of this bug to 'Incomplete' as it's not seen any
activity for some time. If this is still an issue when using a currently
maintained release of Ubuntu then please let us know which one(s)
otherwise this bug report can be left to expire in approximately 60 days
time.

** Changed in: xorg (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1664501

Title:
  Unable to wake up monitor after it goes to sleep (after locking x
  session, for example)

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Additional info:

  lsb_release:
  Description:  Ubuntu 16.04.1 LTS
  Release:      16.04

  
  I'm using an external monitor attached via VGA (seen as DP2 in xrandr output) 
in an extended desktop configuration (not cloned). Whenever the X session 
starts some kind of screen saving (for example, after locking the screen), the 
external monitor and the laptop screen both go to a saving power state.

  After that, If I try to wake them up (moving cursor, touch keys,
  etc.), only the laptop's panel goes back. The external monitor stays
  in a suspended state. If I force it to wake up and scan inputs, it
  doesn't find any, and it doesn't appear as conencted in xrandr otput.

  The only way I've found to wake it up is by performing the following
  sequence of operations:

  ALT+F1 [switch to first tty/console] --> this does wake up and activate the 
monitor, mirroring
  login as my user
  $ xrandr -d :0 #DP2 still doesn't appear
  logout
  ALT+F7 [go back to X]

  At this point, the external monitor is working and X detects it and
  re-enables the extended desktop

  Doing just ALT+F1/ALT+F7, doesn't work (I need to execute xrandr in
  order to make the whole thing work)

  Doing xrandr from the graphical environment (directly in a xterminal
  in the Xsession) doesn't wake up the monitor

  Looks like there's no need to add any addictional operation/parameter
  to xrandr in order to make this process work, no need to set output
  settings, etc. Just issue "xrandr -d :0" and things magically work

  Thanks in advance

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Feb 14 10:54:19 2017
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Sky Lake Integrated Graphics [8086:1916] (rev 07) (prog-if 
00 [VGA controller])
     Subsystem: Hewlett-Packard Company Skylake Integrated Graphics [103c:8079]
  MachineType: HP HP EliteBook 840 G3
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-62-generic 
root=ZFS=rpool/ROOT/ubuntu ro boot=zfs quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/22/2016
  dmi.bios.vendor: HP
  dmi.bios.version: N75 Ver. 01.05
  dmi.board.name: 8079
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 85.61
  dmi.chassis.asset.tag: 5CG6247TWJ
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrN75Ver.01.05:bd03/22/2016:svnHP:pnHPEliteBook840G3:pvr:rvnHP:rn8079:rvrKBCVersion85.61:cvnHP:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G3
  dmi.sys.vendor: HP
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Tue Feb 14 10:49:09 2017
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5312 
   vendor                                     CMN
  xserver.version: 2:1.18.4-0ubuntu0.2

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