From: Rong Zhang Date: Fri, 31 Jul 2026 13:45:05 +0000 (+0800) Subject: ALSA: usb-audio: Add QUIRK_FLAG_MIXER_GET_CUR_BROKEN for Logitech PRO X 2 LIGHTSPEED X-Git-Tag: v7.2-rc7~21^2~6 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c973e61895db8fe4a69d8b33de92068d135cafd8;p=thirdparty%2Flinux.git ALSA: usb-audio: Add QUIRK_FLAG_MIXER_GET_CUR_BROKEN for Logitech PRO X 2 LIGHTSPEED The UAC mixer of the Logitech PRO X 2 LIGHTSPEED has broken mixer GET_CUR behavior but otherwise works fine. Add a quirk table entry matching VID/PID=0x046d/0x0af7 and apply the MIXER_GET_CUR_BROKEN quirk flag to make the mixer usable again. Quirky device sample (after applying the quirk flag): usb 3-2.1: New USB device found, idVendor=046d, idProduct=0af7, bcdDevice= 1.00 usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 3-2.1: Product: PRO X 2 LIGHTSPEED usb 3-2.1: Manufacturer: Logitech usb 3-2.1: SerialNumber: 0000000000000000 usb 3-2.1: 2:0: broken mixer GET_CUR (-18944/0/256 => -2662) usb 3-2.1: 6:0: broken mixer GET_CUR (-18944/0/256 => 0) Fixes: 86aa1ea1f15c ("ALSA: usb-audio: Do not expose sticky mixers") Suggested-by: Brian van den Berg Reported-by: Brian van den Berg Link: https://lore.kernel.org/all/370007e6-b73b-4bfc-8410-a860781c7ad7@proton.me/ Signed-off-by: Rong Zhang Link: https://patch.msgid.link/20260731-uac-lg-pro-x-2-ls-v1-1-268eaefe66ab@rong.moe Signed-off-by: Takashi Iwai --- diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index d2a111ee50ab..c90c89200baf 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2256,6 +2256,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { DEVICE_FLG(0x046d, 0x0a8f, /* Logitech H390 headset */ QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE), + DEVICE_FLG(0x046d, 0x0af7, /* Logitech PRO X 2 LIGHTSPEED */ + QUIRK_FLAG_MIXER_GET_CUR_BROKEN), DEVICE_FLG(0x0499, 0x1506, /* Yamaha THR5 */ QUIRK_FLAG_GENERIC_IMPLICIT_FB), DEVICE_FLG(0x0499, 0x1509, /* Steinberg UR22 */