Public bug reported:

I had a problem where my monitor connected to the Display Port didn't
work but the monitor at the DVI Port was working fine.

The only way I manage to get the Display Monitor working was to boot
with only this monitor connected and after the Desktop was loaded I
could connect the DVI Port and it would work fine.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-37.42~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-37-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.15
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: Mon Mar 19 00:55:50 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:67df] (rev c7) (prog-if 00 
[VGA controller])
   Subsystem: PC Partner Limited / Sapphire Technology Device [174b:e347]
InstallationDate: Installed on 2018-03-19 (0 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic.efi.signed 
root=UUID=b539d681-84bf-4093-b7db-2cc19cdd469e ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/26/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: FD
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 970A-DS3P
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFD:bd02/26/2016:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn970A-DS3P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.85-5~x~padoka0
version.libgl1-mesa-dri: libgl1-mesa-dri 1:17.3.6-2~x~padoka0
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 1:17.3.6-2~x~padoka0
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Mon Mar 19 00:33:07 2018
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.5-0ubuntu2~16.04.1
xserver.video_driver: amdgpu

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu xenial

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https://bugs.launchpad.net/bugs/1756783

Title:
  Problems at display the second monitor

Status in xorg package in Ubuntu:
  New

Bug description:
  I had a problem where my monitor connected to the Display Port didn't
  work but the monitor at the DVI Port was working fine.

  The only way I manage to get the Display Monitor working was to boot
  with only this monitor connected and after the Desktop was loaded I
  could connect the DVI Port and it would work fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-37.42~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-37-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.15
  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: Mon Mar 19 00:55:50 2018
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:67df] (rev c7) (prog-if 
00 [VGA controller])
     Subsystem: PC Partner Limited / Sapphire Technology Device [174b:e347]
  InstallationDate: Installed on 2018-03-19 (0 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
(20180228)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-37-generic.efi.signed 
root=UUID=b539d681-84bf-4093-b7db-2cc19cdd469e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/26/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FD
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: 970A-DS3P
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFD:bd02/26/2016:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn970A-DS3P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.85-5~x~padoka0
  version.libgl1-mesa-dri: libgl1-mesa-dri 1:17.3.6-2~x~padoka0
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 1:17.3.6-2~x~padoka0
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Mon Mar 19 00:33:07 2018
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.5-0ubuntu2~16.04.1
  xserver.video_driver: amdgpu

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