diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index f458328f9ec4..33380cad3a73 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1385,7 +1385,7 @@ free_buf:
 
 static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev)
 {
-	msleep(2000);
+	msleep(4000);
 
 	return 0;
 }
@@ -1628,7 +1628,7 @@ int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
 				  unsigned int id)
 {
 	switch (id) {
-	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
+	case USB_ID(0x07fd, 0x0008): /* MOTU M Series, 1st hardware version */
 		return snd_usb_motu_m_series_boot_quirk(dev);
 	}