[System Product Name, C-Media Generic, Green Line Out, Rear] Underruns, dropouts or crackling sound

[Wim Pauwels]

I am not sure about what is the default in my problem but when i connect my TERRATEC AUREON 7.1 I get after a fresh install this very bad sound crackles during playback and also some kind of weard echo like it seems to be a record line directly to the play output connected_

I have been working around it since a week or so and al of the possibilities i tried didn't workout for me

it seems to be a driver problem in alsa because i don't get better sound in any case than this crackling screeching and also some kind of echo noise overlayed above the sound on ANY output or INPUT

very annoying because in windows this asio driver card played well
butI really need ubuntu for some things. although with a better sound card quality than nowadays it seems to be

can people be generous here and try to speed up the solution
because I really need to sing and make records on the system.
I can delay them but not very long time...

Kind regards,
Wim Pauwels

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-33.37-lowlatency 5.4.34
Uname: Linux 5.4.0-33-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Jun 6 18:31:59 2020
InstallationDate: Installed on 2020-06-02 (3 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:CMedia failed
Symptom_Card: CM8888 [Oxygen Express] (HDA Controller) - HDA C-Media
Symptom_Jack: Green Line Out, Rear
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [System Product Name, C-Media Generic, Green Line Out, Rear] Underruns, dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/02/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M5A78L-M/USB3
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2101:bd12/02/2014:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM5A78L-M/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2020-06-06T18:25:11.055281