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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 bug report has any relevance when using
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** Changed in: xorg (Ubuntu)
       Status: Confirmed => Incomplete

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Touch seeded packages, which is subscribed to xorg in Ubuntu.

  Main monitor doesn't wake up after system suspend

Status in xorg package in Ubuntu:

Bug description:
  If I lock my Unity session (Super+L) and power down my two monitors
  using external power switch, when after a few minutes I restore the
  power to monitors and wake up Ubuntu only my VGA connected LG display
  wakes up. My main monitor - a DisplayPort connected Dell U2410 wakes
  up only for a brief moment (it's power led goes blue from yellow) but
  before any picture would be displayed it goes back to sleep mode (led
  goes yellow again).

  All of this is true only for X session. If I switch to tty1
  (Ctrl+Alt+F1) the Dell wakes up correctly and shows tty1. Going back
  to X (Ctrl+Alt+F7) causes this monitor to go to power save mode again.

  The only means for me to get my main display back in X is to restart
  the computer, as logging in and out of X doesn't help. I have also
  tried running Displays configuration tool while in X, but what it only
  does is that once I click "Detect Displays" button Dell's power led
  goes blue for a brief moment and then immediately back to yellow
  (power save mode).

  I haven't encountered such behavior with Ubuntu 14.04, nor have I
  experienced right after migrating to 16.04. I believe this regression
  showed up with some update within the last two weeks.

  Both monitors are hooked up to AMD Radeon 5850 graphics card.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   Scanning for Btrfs filesystems
   Ubuntu_Root: clean, 690241/3670016 files, 6292028/14652416 blocks
  CompizPlugins: No value set for 
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat May 21 21:22:43 2016
  DistUpgraded: 2016-04-23 22:19:53,020 ERROR got error from PostInstallScript 
./ (Failed to execute child process 
"./" (No such file or directory))
  DistroCodename: xenial
  DistroVariant: ubuntu
   virtualbox, 5.0.18, 4.4.0-21-generic, x86_64: installed
   virtualbox, 5.0.18, 4.4.0-22-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
   Advanced Micro Devices, Inc. [AMD/ATI] Cypress PRO [Radeon HD 5850] 
[1002:6899] (prog-if 00 [VGA controller])
     Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Cypress PRO [Radeon HD 
5850] [1002:0b00]
  InstallationDate: Installed on 2015-08-22 (272 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic 
root=UUID=a709e3c2-0c9b-4102-8135-3a38cc17bd0b ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to xenial on 2016-04-23 (27 days ago) 08/18/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V1.11
  dmi.board.asset.tag: To Be Filled By O.E.M. P55-GD65 (MS-7583)
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrV1.11:bd08/18/2011:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7583:pvr1.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rnP55-GD65(MS-7583):rvr1.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr1.0: MS-7583
  dmi.product.version: 1.0
  version.compiz: compiz 1:
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  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 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
  xserver.bootTime: Sat May 21 20:49:42 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.3-1ubuntu2
  xserver.video_driver: radeon

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