Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: alsa-driver (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1927337
Title:
[USB-Audio - RODECaster Pro, playback] Sound is distorted (21.04)
Status in alsa-driver package in Ubuntu:
Confirmed
Bug description:
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.
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