Public bug reported:

i cant connect my laptop to my tv through an hdmi it says no signal

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
.tmp.unity_support_test.1:
 
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
BootLog:
 
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Thu Aug  3 15:38:45 2017
DistUpgraded: 2017-07-29 00:23:28,354 ERROR got error from PostInstallScript 
./xorg_fix_proprietary.py (Failed to execute child process 
"./xorg_fix_proprietary.py" (No such file or directory))
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Carrizo [1002:9874] (rev c5) (prog-if 
00 [VGA controller])
   Subsystem: Hewlett-Packard Company Carrizo [103c:80b0]
InstallationDate: Installed on 2017-07-14 (20 days ago)
InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
MachineType: HP HP Pavilion Notebook
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-87-generic 
root=UUID=5893fc24-8d35-43ea-8baf-d032c38f7919 ro nomodeset quiet splash 
vt.handoff=7
Renderer: Software
SourcePackage: xorg
UpgradeStatus: Upgraded to xenial on 2017-07-29 (5 days ago)
dmi.bios.date: 07/14/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F.10
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 80B0
dmi.board.vendor: HP
dmi.board.version: 81.27
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF.10:bd07/14/2015:svnHP:pnHPPavilionNotebook:pvr:rvnHP:rn80B0:rvr81.27:cvnHP:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion Notebook
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 2.4.76-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.3
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: Thu Aug  3 15:34:47 2017
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.18.4-0ubuntu0.3

** 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/1708520

Title:
  no hdmi signal

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