For digital audio, if an HDMI device supports audio, it is required to support the baseline format: stereo (uncompressed) PCM. Other formats are optional, with HDMI allowing up to 8 channels of uncompressed audio at sample sizes of 16-bit, 20-bit and 24-bit, with sample rates of 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz and 192 kHz.
HDMI also supports any IEC 61937-compliant compressed audio stream, such as Dolby Digital and DTS, and up to 8 channels of one-bit DSD audio (used on Super Audio CDs) at rates up to four times that of Super Audio CD. With version 1.3, HDMI supports lossless compressed audio streams Dolby TrueHD and DTS-HD Master Audio. As with the YCbCr video, device support for audio is optional. Audio Return Channel (ARC) is a feature introduced in the HDMI 1.4 standard -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1290611 Title: [Clevo W65_67SZ, Intel Haswell HDMI, Digital Out, HDMI] crackling sound and audio up a note Status in “alsa-driver” package in Ubuntu: Incomplete Bug description: installed pavucontrol to get the sound from HDMI but the result is crackle sound and audio is up a note. This problem exists on 13.10 and 14.04 not on 13.04. I noticed the alsa info from 13.4 shows the soundcard: 00:03.0 Audio device: Intel Corporation Haswell HD Audio Controller (rev 06) 00:1b.0 Audio device: Intel Corporation Lynx Point High Definition Audio Controller (rev 05) while from 14.04 00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06) 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: alsa-base 1.0.25+dfsg-0ubuntu4 ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5 Uname: Linux 3.13.0-16-generic x86_64 ApportVersion: 2.13.3-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Mon Mar 10 23:55:20 2014 InstallationDate: Installed on 2014-03-04 (6 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140302) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:HDMI failed Symptom_Card: Built-in Audio - HDA Intel HDMI Symptom_Jack: Digital Out, HDMI Symptom_Type: Underruns, dropouts, or "crackling" sound Title: [W65_67SZ, Intel Haswell HDMI, Digital Out, HDMI] Underruns, dropouts or crackling sound UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/05/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1.03.03RTO dmi.board.asset.tag: Tag 12345 dmi.board.name: W65_67SZ dmi.board.vendor: Notebook dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: Notebook dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.03.03RTO:bd12/05/2013:svnNotebook:pnW65_67SZ:pvrNotApplicable:rvnNotebook:rnW65_67SZ:rvrNotApplicable:cvnNotebook:ct9:cvrN/A: dmi.product.name: W65_67SZ dmi.product.version: Not Applicable dmi.sys.vendor: Notebook To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1290611/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
