On Ubuntu 12.10 "Quantal Quetzal" and later you will no longer be able
to use the proprietary fglrx driver on your Radeon HD 4850/4870 as AMD
have dropped support for this card in their drivers around the same time
that they added support to their drivers for the newer kernel and
xserver used in Quantal.

You will be able to use the open-source radeon driver, but note that
HDMI audio on AMD/ATI GPUs has been disabled by the upstream kernel
developers as it causes blank screens on a lot of systems.

You can re-enable HDMI audio by adding radeon.audio=1 to your GRUB
kernel boot options as described at
https://help.ubuntu.com/community/Grub2/Troubleshooting#Editing_the_GRUB_2_Menu_During_Boot

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to fglrx-installer in Ubuntu.
https://bugs.launchpad.net/bugs/970795

Title:
  [MSI 785GM-E51 (MS-7596), ATI R6xx HDMI, Digital Out, HDMI] No sound
  at all

Status in “fglrx-installer” package in Ubuntu:
  Confirmed

Bug description:
   sudo lshw -class multimedia
    *-multimedia            
         description: Audio device
         product: RV770 HDMI Audio [Radeon HD 4850/4870]
         vendor: Hynix Semiconductor (Hyundai Electronics)
         physical id: 0.1
         bus info: pci@0000:01:00.1
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: pm pciexpress msi bus_master cap_list
         configuration: driver=snd_hda_intel latency=0
         resources: irq:43 memory:feaec000-feaeffff
    *-multimedia
         description: Audio device
         product: SBx00 Azalia (Intel HDA)
         vendor: Hynix Semiconductor (Hyundai Electronics)
         physical id: 14.2
         bus info: pci@0000:00:14.2
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: pm bus_master cap_list
         configuration: driver=snd_hda_intel latency=64
         resources: irq:16 memory:fe9f4000-fe9f7fff

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
  Uname: Linux 3.2.0-21-generic i686
  NonfreeKernelModules: fglrx
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0-0ubuntu2
  Architecture: i386
  Date: Sun Apr  1 20:41:30 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed
  Symptom_Card: RV770 HDMI Audio [Radeon HD 4850/4870] - HDA ATI HDMI
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: No sound at all
  Title: [MS-7596, ATI R6xx HDMI, Digital Out, HDMI] No sound at all
  UpgradeStatus: Upgraded to precise on 2012-01-11 (80 days ago)
  dmi.bios.date: 09/03/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V2.10
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 785GM-E51 (MS-7596)
  dmi.board.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  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.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV2.10:bd09/03/2010:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7596:pvr1.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rn785GM-E51(MS-7596):rvr1.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr1.0:
  dmi.product.name: MS-7596
  dmi.product.version: 1.0
  dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO.,LTD

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