ALSA: usb-audio: Skip reading sample rate on M-Audio Venom

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The M-Audio Venom (0763:2084) is an USB Audio Class 1 compliant
synth with an integrated audio interface, it does not implement
GET_CUR on SAMPLING_FREQ_CONTROL, hanging up if requested on
endpoint 0.

The first class request issued by the driver after enumeration is
a GET_CUR on endpoint 0x02, freezing the device's USB microcontroller.
Timing out on every transfer afterwards with -ETIMEDOUT, such as
SET_INTERFACE, so neither the mixer nor any streaming interface is set up.

Analyzing a USBPcap capture of the Windows driver I found it never
requests the sampling frequency, as the synth exposes a single
discrete of 44100Hz on both streaming interfaces, thus asking for it
is unnecessary.

So I applied get_sample_rate to avoid this check, and
disable_autosuspend because the synth doesn't come back from being
suspended.

Signed-off-by: Federico Valentín Andrade <fandrade@frba.utn.edu.ar>
Link: https://patch.msgid.link/20260824140211.17003-2-fandrade@frba.utn.edu.ar
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Federico Valentín Andrade 2026-08-24 11:02:10 -03:00 • committed by Takashi Iwai

parent e72d5659a2

commit b3be0e5bed

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sound/usb/quirks.c

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