[Bug 208353] Distorted Audio Output Through USB C Docking Station

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208353

--- Comment #1 from Alan Stern (stern@rowland.harvard.edu) ---
Bring this to the attention of the person who wrote the offending commit:

On Sun, Jun 28, 2020 at 03:19:06PM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=208353
> 
>             Bug ID: 208353
>            Summary: Distorted Audio Output Through USB C Docking Station
>            Product: Drivers
>            Version: 2.5
>     Kernel Version: 5.4.49
>           Hardware: All
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: USB
>           Assignee: drivers_usb@kernel-bugs.kernel.org
>           Reporter: pbui@kernel.bx612.space
>         Regression: No
> 
> Created attachment 289909
>   --> https://bugzilla.kernel.org/attachment.cgi?id=289909&action=edit
> Output of alsa-info.sh
> 
> With kernel 5.4.49 the audio output through my Dell WD19 Docking station is
> now
> laggy and distorted (sounds like only bass frequencies are emitted). 
> Previously, audio output through the dock worked just fine with all versions
> of
> 4.19.x and 5.4.x.
> 
> After looking through the changelog for 5.4.49, I was able to locate the
> offending patch:
> 
>
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/patch/?id=aba41867dd66939d336fdf604e4d73b805d8039f

This is upstream commit f0bd62b64016 ("ALSA: usb-audio: Improve frames 
size computation").

Alan Stern

> Reverting this patch allows audio to play normally through my docking
> station.

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