[Bug 1966066] Re: audio from external sound card is distorted

This bug is awaiting verification that the linux-
intel-5.13/5.13.0-1012.12 kernel in -proposed solves the problem. Please
test the kernel and update this bug with the results. If the problem is
solved, change the tag 'verification-needed-focal' to 'verification-
done-focal'. If the problem still exists, change the tag 'verification-
needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-focal

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https://bugs.launchpad.net/bugs/1966066

Title:
audio from external sound card is distorted

Status in linux package in Ubuntu:
Fix Committed
Status in linux-signed-hwe-5.13 package in Ubuntu:
Invalid
Status in linux source package in Impish:
Fix Released
Status in linux-signed-hwe-5.13 source package in Impish:
Invalid
Status in linux source package in Jammy:
Fix Committed
Status in linux-signed-hwe-5.13 source package in Jammy:
Invalid

Bug description:
[Impact]
Commit d215f63d49da ("ALSA: usb-audio: Check available frames for the
next packet size") landed in 5.13.0-35 introduced regression to USB
audio device.

It's because this patch introduced the available frame size check, but
the conversion forgot to initialize the temporary variable properly.

A workaround is to modify /etc/pulse/daemon.conf, set the
default-sample-rate to 48000, uncomment it by removing the semicolon
at the beginning of the line. And restart pulseaudio with:
systemctl --user restart pulseaudio.service

[Fix]
* 23939115 ALSA: usb-audio: Fix packet size calculation regression
This patch can be cherry-picked into Impish kernel, and it's already in
the master-next branch of Jammy tree.

[Test]
Test kernels built with 5.13.0-37 + this patch, can be found in:
* Focal-5.13 - https://people.canonical.com/~phlin/kernel/lp-1966066-usb-audio/focal/
* Impish-5.13 - https://people.canonical.com/~phlin/kernel/lp-1966066-usb-audio/impish/

Both kernels were tested by affected users and they're working as
expected.

[Where problems could occur]
If this patch is incorrect, it might affect USB audio devices.


[Original Bug Report]
The sound card is a Focusrite Scarlett 2i2.

The sound is distorted everywhere.

Sound via HDMI works.

Seen others having the same problem:
(Edit because of previously wrong link here) https://askubuntu.com/questions/1398614/upgrading-to-5-13-0-37-generic-breaks-audio-with-external-audio-card

ubuntu release: Ubuntu 20.04.4 LTS
package name involved in bug: linux-image-5.13.0-37-generic

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.13.0-37-generic 5.13.0-37.42~20.04.1
ProcVersionSignature: Ubuntu 5.13.0-35.40~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-35-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 23 12:56:02 2022
InstallationDate: Installed on 2020-12-18 (459 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-hwe-5.13
UpgradeStatus: No upgrade log present (probably fresh install)

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