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[Londé Ngosso <londe.ngosso@xxxxxxxxx>]

After an update, hdmi was not working anymore (no video and no sound). 
So i did the command:
sudo gedit /etc/default/grub

and changed "GRUB_CMDLINE_LINUX_DEFAULT="NOMODESET"" into
"GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1""

then 
sudo update-grub

it fixed the problem for me.

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https://bugs.launchpad.net/bugs/1542934

Title:
  hdmi not working

Status in linux package in Ubuntu:
  Invalid

Bug description:
  hdmi not working.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  Uname: Linux 4.5.0-040500rc2-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sun Feb  7 22:10:31 2016
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:06ae]
  InstallationDate: Installed on 2015-10-30 (100 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: Dell Inc. Inspiron 5558
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.5.0-040500rc2-generic root=UUID=271decaf-2c52-4d45-af0d-da55a999fd55 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/06/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0KG6JV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/06/2015:svnDellInc.:pnInspiron5558:pvr01:rvnDellInc.:rn0KG6JV:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Inspiron 5558
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.65+git20151026.c745e541-0ubuntu0ricotz~trusty
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  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: Sun Feb  7 13:33:05 2016
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                8638
   vendor                                     JVC
  xserver.version: 2:1.17.1-0ubuntu3.1~trusty1

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