Bug#1153053: UR22C playback fails with kernel 6.12.115 but works with kernel 7.2.11

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1153053: UR22C playback fails with kernel 6.12.115 but works with kernel 7.2.11
Date	2026-11-05 09:30 +0100
Message-ID	<NW117-9Xqr-5@gated-at.bofh.it> (permalink)
References	<NVQ5I-9Rwi-3@gated-at.bofh.it> <NVQ5I-9Rwi-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi,

On Wed, Nov 04, 2026 at 08:44:37PM +0000, Wolle Hartz wrote:
> Package: linux-image-6.12.115+deb13.1-amd64
> 
> Severity: normal
> 
> Package: linux-image-6.12.115+deb13.1-amd64
> 
> Source: linux
> 
> I am reporting a possible regression affecting USB audio playback
> with the Steinberg UR22C audio interface.
> 
> Summary
> 
> With Debian kernel 6.12.115+deb13.1-amd64, the Steinberg UR22C is
> detected correctly by the USB subsystem and ALSA. PipeWire also
> recognizes the device and creates an audio sink.
> 
> However, audio playback fails. Direct ALSA playback returns an I/O
> error (-EIO).
> 
> The problem was initially observed in a VirtualBox environment and
> was subsequently reproduced on separate physical hardware. The same
> interface works under Windows 11 and also worked with a CachyOS live
> system.
> 
> After installing and booting the Debian Trixie Backports kernel
> 7.2.11, the problem was resolved. The UR22C playback works with that
> kernel.
> 
> This suggests a possible regression or compatibility issue in the
> 6.12 kernel series. I have not performed a kernel bisect, so I
> cannot identify the exact commit responsible.

You are talking above above a possible regression. Can you confirm I
understood correctly, it worked before in a trixie provided kernel,
e.g. 6.12.113-1 but not anymore in 6.12.115-2? If yes that smells like
the known tracked regression (covered in #1152888). But I would first
want to understand if it worked in earlier 6.12.y versions.

Regards,
Salvatore

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Bug#1153053: UR22C playback fails with kernel 6.12.115 but works with kernel 7.2.11 Salvatore Bonaccorso <carnil@debian.org> - 2026-11-05 09:30 +0100
  Bug#1153053: AW: Re: Bug#1153053: UR22C playback fails with kernel 6.12.115 but works with kernel 7.2.11 Salvatore Bonaccorso <carnil@debian.org> - 2026-11-06 06:20 +0100

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