From: Anton Swart Date: Sun, 3 May 2026 21:15:17 +0000 (+0200) Subject: ALSA: usb-audio: Add quirk flags for AlphaTheta EUPHONIA X-Git-Tag: v7.1-rc3~27^2~10 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f80785888f7c0980a49545b87a80e3817c9ed7c6;p=thirdparty%2Fkernel%2Flinux.git ALSA: usb-audio: Add quirk flags for AlphaTheta EUPHONIA The AlphaTheta EUPHONIA (VID 0x2b73, PID 0x0047) is a USB Audio Class 2 DJ mixer that requires implicit feedback for full-duplex operation. The capture endpoint (0x83 IN, interface 2) acts as the implicit feedback source for the playback endpoint (0x03 OUT, interface 1), and the device firmware does not send isochronous data on the capture endpoint unless the host is simultaneously sending data on the playback endpoint, i.e. playback must be started first. Without QUIRK_FLAG_PLAYBACK_FIRST the kernel waits for capture URBs before submitting playback URBs, creating a deadlock: the device waits for playback data and the host waits for capture data. Without QUIRK_FLAG_GENERIC_IMPLICIT_FB the kernel does not detect the implicit feedback relationship between the two interfaces. The same flag combination is already used for the Behringer UMC202HD, UMC204HD and UMC404HD (0x1397:0x0507/0x0508/0x0509), which exhibit the identical implicit-feedback topology. Tested on Raspberry Pi 5 with kernel 6.12.75; continuous full-duplex streaming at 96 kHz / 24-bit, zero XRUNs. Signed-off-by: Anton Swart Link: https://patch.msgid.link/20260503211517.14332-1-anton.swart.jhb@gmail.com Signed-off-by: Takashi Iwai --- diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index f77ff05dff0b..b17bdae09bc3 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2460,6 +2460,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_GENERIC_IMPLICIT_FB), DEVICE_FLG(0x2b53, 0x0031, /* Fiero SC-01 (firmware v1.1.0) */ QUIRK_FLAG_GENERIC_IMPLICIT_FB), + DEVICE_FLG(0x2b73, 0x0047, /* AlphaTheta EUPHONIA */ + QUIRK_FLAG_PLAYBACK_FIRST | QUIRK_FLAG_GENERIC_IMPLICIT_FB), DEVICE_FLG(0x2d95, 0x8011, /* VIVO USB-C HEADSET */ QUIRK_FLAG_CTL_MSG_DELAY_1M), DEVICE_FLG(0x2d95, 0x8021, /* VIVO USB-C-XE710 HEADSET */