diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 4f40ba8..fce9b88 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -446,6 +446,9 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 				    validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
 				    buf, val_len) >= 0) {
+			snd_printk(" DEBUG: %s(): request %08x requesttype %08x, value %04x, index %04x, size %d\n",
+					__func__, request, USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
+					validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), val_len);
 			snd_usb_autosuspend(chip);
 			return 0;
 		}