Public bug reported: I got a Rodecaster Pro USB device that has been causing trouble before and already lead to quirk handling in the kernel for the sample rate, see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/usb/format.c?h=v5.8#n412
The Rodecaster is running fine on my laptop, but on my desktop, only audio input is working. The audio output is distorted. It's played kind of very slowly. Interestingly, if the source is a video file, the video plays slower, e.g. YouTube in a browser. I have never seen anything like that before. I have tried to figure out what the cause might be and I think I have reached the end of where I can get to on my own. I have documented most things at https://ubuntuforums.org/showthread.php?t=2461568 Putting my last step it in a nutshell: I have booted both my computers with a plain Ubuntu 21.04 from a pen drive (it uses kernel version 5.11.0-16-generic) to make sure it's not some different configuration that I have set up over the years on my systems (both Ubuntu 20.04 with kernel 5.8.18). I attached the Rodecaster. It runs fine on my laptop, but not on my desktop (used the output test from). I then detected the card number with aplay -l I killed pulseaudio with pulseaudio -k I then played the same sample (encoded in 48000 Hz in PCM signed 32 bit little endian format) using aplay -f S32_LE -c 2 -r 48000 -D hw:x ~/sample.wav where x is the appropriate card number and the rest of the arguments meet the Rodecaster's narrow specification. It's playing fine on the laptop, but distorted on the desktop. As far as I understand using aplay this way without a plugin should send the file directly to the device, so I assume there's something on the way from aplay to the Rodecaster that's interfering (kernel or even some piece of hardware) - and that definitely is where my expertise ends (rather a little before :-)). I'll gladly contribute any information that could be useful and I will willingly help to debug this problem if it may be related to the kernel. If there's anything I can do, please let me know. Cheers, Oliver ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: alsa-base 1.0.25+dfsg-0ubuntu7 ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12 Uname: Linux 5.11.0-16-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu65 Architecture: amd64 CasperMD5CheckResult: pass CasperVersion: 1.461 CurrentDesktop: ubuntu:GNOME Date: Thu May 6 09:33:40 2021 LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420) PackageArchitecture: all ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Pro failed Symptom_Card: RODECaster Pro - RODECaster Pro Symptom_Type: Digital clip or distortion, or "overdriven" sound Title: [USB-Audio - RODECaster Pro, playback] Sound is distorted UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/30/2020 dmi.bios.release: 5.17 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: A.40 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: B550-A PRO (MS-7C56) 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.:bvrA.40:bd10/30/2020:br5.17:svnMicro-StarInternationalCo.,Ltd.:pnMS-7C56:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB550-APRO(MS-7C56):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0: dmi.product.family: To be filled by O.E.M. dmi.product.name: MS-7C56 dmi.product.sku: To be filled by O.E.M. dmi.product.version: 1.0 dmi.sys.vendor: Micro-Star International Co., Ltd. ** Affects: alsa-driver (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug hirsute ** Summary changed: - [USB-Audio - RODECaster Pro, playback] Sound is distorted + [USB-Audio - RODECaster Pro, playback] Sound is distorted (21.04) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1927337 Title: [USB-Audio - RODECaster Pro, playback] Sound is distorted (21.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1927337/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
