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Groups > linux.debian.kernel > #94751

Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113)

Cross-posted to 2 groups.

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Dear Maintainer,

I am experiencing the same regression on Debian Trixie with
a different device model from the MOTU M-Series:
MOTU M2, hardware revision: 1, firmware version: 1.02 (latest).

- Working kernel version: 6.12.113+deb13-amd64

- Broken kernel version:  6.12.115+deb13.1-amd64

the M2 is recognized on the USB level, but as soon as audio streaming is
initiated, the driver deadlocks.  In my case, running   

    jackd -dalsa -dhw:1 -r48000 -p256 -n3

and then starting audacity results in a 5-second timeout:

JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Driver is not running
Cannot create new client

Pipewire and pulseaudio were disabled.  Testing with a smaller or larger
buffer size (-p 64 or -p 1024, respectively) does not change the
behavior. Booting back into 6.12.113 fixes the problem immediately.

CPU: Intel Core Ultra 7 255U
USB controller: Intel Corporation Arrow Lake USB 3.2 xHCI Controller

thanks,
Sebastian

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Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113) Benjamin Scherrer <benjamin@wagnerbrutal.de> - 2026-11-02 22:20 +0100
  Processed: Re: Bug#1152888: Regression: MOTU M4 USB audio  playback fails with EIO on Linux 6.12.115 (works on 6.12.113) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-11-03 17:20 +0100
  Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113) Salvatore Bonaccorso <carnil@debian.org> - 2026-11-03 17:20 +0100
    Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113) Benjamin Scherrer <benjamin@wagnerbrutal.de> - 2026-11-03 23:50 +0100
  Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113) Sebastian Kiesel <sebastian-debian-reportbug@skiesel.de> - 2026-11-03 17:40 +0100
  Bug#1152888:  Michele Zelioli <michele.zelioli@ik.me> - 2026-11-03 21:50 +0100
  Bug#1152888: MOTU M2 also affected by 6.12.115 USB audio regression Christopher Ludwin <cjludwin@pm.me> - 2026-11-03 23:10 +0100
  Bug#1152888: Regression: MOTU M4 USB audio playback fails with  EIO on Linux 6.12.115 (works on 6.12.113) "smg" <smgdream@foxmail.com> - 2026-11-04 04:20 +0100
  Processed: Re: Bug#1152888: Regression: MOTU M4 USB audio  playback fails with EIO on Linux 6.12.115 (works on 6.12.113) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-11-04 06:00 +0100
  Bug#1152888: Regression: MOTU M4 USB audio playback fails with  EIO on Linux 6.12.115 (works on 6.12.113) "smg" <smgdream@foxmail.com> - 2026-11-04 16:20 +0100
  Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113) Benjamin Scherrer <benjamin@wagnerbrutal.de> - 2026-11-04 17:30 +0100
  Bug#1152888: Regression: MOTU M4 USB audio playback fails with EIO on Linux 6.12.115 (works on 6.12.113) Sebastian Kiesel <sebastian-debian-reportbug@skiesel.de> - 2026-11-04 18:50 +0100
  Processed: Re: Bug#1152888: Regression: MOTU M4 USB audio  playback fails with EIO on Linux 6.12.115 (works on 6.12.113) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-11-05 07:50 +0100

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