From 9508f9f122d4af799cf4a422eb31eedd888b76d2 Mon Sep 17 00:00:00 2001 From: Zhang Heng Date: Tue, 11 Aug 2026 10:49:02 +0800 Subject: [PATCH] ALSA: usb-audio: Fix popping noise on Valeton GP-200 The Valeton GP-200 guitar multi-effects processor exhibits a continuous popping noise (~6Hz) during playback and recording. Force implicit feedback to resolve the issue. Closes: https://bugzilla.kernel.org/show_bug.cgi?id=221662 Signed-off-by: Zhang Heng Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20260811024902.134457-4-zhangheng@kylinos.cn --- sound/usb/quirks.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index d00d6a543a9f..eb0d012cf856 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2526,6 +2526,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_ALIGN_TRANSFER), DEVICE_FLG(0x534d, 0x2109, /* MacroSilicon MS2109 */ QUIRK_FLAG_ALIGN_TRANSFER), + DEVICE_FLG(0x84ef, 0x002a, /* Valeton GP-200 */ + QUIRK_FLAG_GENERIC_IMPLICIT_FB), DEVICE_FLG(0x84ef, 0x0082, /* Hotone Audio Pulze Mini */ QUIRK_FLAG_MIXER_PLAYBACK_LINEAR_VOL | QUIRK_FLAG_MIXER_CAPTURE_LINEAR_VOL),