[PATCH] ALSA: usb-audio: Add quirk flags for SC13A
From: Ai Chao
Date: Tue Jun 16 2026 - 22:52:49 EST
The SC13A ( VID 0x1ff7, PID 0x0f81) not support reading the current
sample rate and results in an error message printed to kmsg. Set
QUIRK_FLAG_GET_SAMPLE_RATE to skip the sample rate check.
Quirky device sample:
usb 3-5.2.4.1: new high-speed USB device number 11 using xhci_hcd
usb 3-5.2.4.1: New USB device found, idVendor=1ff7, idProduct=0f81
usb 3-5.2.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-5.2.4.1: Product: SC13A
usb 3-5.2.4.1: Manufacturer: Linux Foundation
usb 3-5.2.4.1: SerialNumber: 000002
usb 3-5.2.4.1: Found UVC 1.50 device SC13A (1ff7:0f81)
usb 3-5.2.4.1: 3:1: cannot get freq at ep 0x86
usb 3-5.2.4.1: Warning! Unlikely big volume range (=4096),
cval->res is probably wrong.
usb 3-5.2.4.1: [5] FU [Mic Capture Volume] ch = 1, val = 0/4096/1
usbcore: registered new interface driver snd-usb-audio
usb 3-5.2.4.1: 3:1: cannot get freq at ep 0x86
usb 3-5.2.4.1: 3:1: cannot get freq at ep 0x86
Signed-off-by: Ai Chao <aichao@xxxxxxxxxx>
---
sound/usb/quirks.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 46718c5499df..e6c011cf8ffd 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2413,6 +2413,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
QUIRK_FLAG_GET_SAMPLE_RATE | QUIRK_FLAG_MIC_RES_16),
DEVICE_FLG(0x1bcf, 0x2283, /* NexiGo N930AF FHD Webcam */
QUIRK_FLAG_GET_SAMPLE_RATE | QUIRK_FLAG_MIC_RES_16),
+ DEVICE_FLG(0x1ff7, 0x0f81, /* SC13A Webcam */
+ QUIRK_FLAG_GET_SAMPLE_RATE),
DEVICE_FLG(0x2040, 0x7200, /* Hauppauge HVR-950Q */
QUIRK_FLAG_SHARE_MEDIA_DEVICE | QUIRK_FLAG_ALIGN_TRANSFER),
DEVICE_FLG(0x2040, 0x7201, /* Hauppauge HVR-950Q-MXL */
--
2.34.1