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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1186879 Title: AMD Radeon HD 6250 No HDMI audio output with radeon driver Status in “linux” package in Ubuntu: Confirmed Bug description: CID: 201203-10697 Asus X55U (12.04.2) By using the radeon driver, there is no HDMI audio output. But by using the fglrx driver, HDMI audio works. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.5.0-32-generic 3.5.0-32.53~precise1 ProcVersionSignature: Ubuntu 3.5.0-32.53~precise1-generic 3.5.7.11 Uname: Linux 3.5.0-32-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25. ApportVersion: 2.0.1-0ubuntu17.2 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 1: Generic_1 [HD-Audio Generic], device 0: VT1802 Analog [VT1802 Analog] Subdevices: 1/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ubuntu 1663 F.... pulseaudio /dev/snd/pcmC1D0c: ubuntu 1663 F...m pulseaudio /dev/snd/controlC0: ubuntu 1663 F.... pulseaudio CRDA: country TW: (2402 - 2472 @ 40), (3, 27) (5270 - 5330 @ 40), (3, 17), DFS (5735 - 5815 @ 40), (3, 30) Card0.Amixer.info: Card hw:0 'Generic'/'HD-Audio Generic at 0xfeb44000 irq 47' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100200' Controls : 6 Simple ctrls : 1 Card0.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Card1.Amixer.info: Card hw:1 'Generic_1'/'HD-Audio Generic at 0xfeb40000 irq 16' Mixer name : 'VIA VT1802' Components : 'HDA:11068446,10431c23,00100000' Controls : 28 Simple ctrls : 16 Date: Mon Jun 3 14:11:32 2013 HibernationDevice: RESUME=UUID=fdaaa1bf-4281-4fdc-a2cf-8ae08a9d29a4 InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213) Lsusb: Bus 001 Device 002: ID 058f:a014 Alcor Micro Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub MachineType: ASUSTeK COMPUTER INC. X55U MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-32-generic root=UUID=d034ccfb-863a-43af-ba1c-4e8d6a4638bc ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.5.0-32-generic N/A linux-backports-modules-3.5.0-32-generic N/A linux-firmware 1.79.4 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/03/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: X55U.410 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: X55U dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX55U.410:bd09/03/2012:svnASUSTeKCOMPUTERINC.:pnX55U:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX55U:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: X55U dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1186879/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
