Hi ALSA devs,
I'm reporting an issue with the Mackie DLZ Creator XS USB audio device on Linux (tested on Ubuntu 24.04 and 25.05 with kernel 6.8+).
The device is detected correctly via ALSA (card 2: XS), but as soon as playback is initiated – whether via `aplay` or `speaker-test` – it disconnects with `write error: -77, File descriptor in bad state`.
Relevant kernel logs show: usb 3-7: Product: DLZ Creator XS usb 3-7: Manufacturer: LOUD Audio, LLC usb 3-7: USB disconnect, device number X
This occurs with and without PipeWire/udev running.
I’ve created a full ALSA log with `alsa-info` and opened a Kernel Bugzilla entry: https://bugzilla.kernel.org/show_bug.cgi?id=220143
Is there any known quirk or patch needed for this hardware? Or a way to assist debugging further (usbmon trace etc.)?
Thanks in advance, Brian Knutsson