Public bug reported:

after conecting TV over HDMI, Ubuntu doenst find the external display

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.10.0-38.42~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-38-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.10
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 Nov 14 10:29:17 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation G94GLM [Quadro FX 2700M] [10de:063a] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Hewlett-Packard Company G94GLM [Quadro FX 2700M] [103c:30ec]
InstallationDate: Installed on 2017-09-10 (64 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
MachineType: Hewlett-Packard HP EliteBook 8730w
PccardctlStatus:
 Socket 0:
   3.3V
  16-bit
  PC Card
   Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-38-generic 
root=UUID=95c3f524-8551-407a-91a0-65632f3854b3 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/03/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68PAD Ver. F.13
dmi.board.name: 30EC
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 91.25
dmi.chassis.asset.tag: CNU911000L
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68PADVer.F.13:bd12/03/2010:svnHewlett-Packard:pnHPEliteBook8730w:pvrF.13:rvnHewlett-Packard:rn30EC:rvrKBCVersion91.25:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8730w
dmi.product.version: F.13
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.2
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: Tue Nov 14 09:58:47 2017
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.3-1ubuntu1~16.04.4
xserver.video_driver: nouveau

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


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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https://bugs.launchpad.net/bugs/1732116

Title:
  HDMI  device is not working / not found

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