On Wed, Jun 10, 2020 at 04:49:14PM +0300, Alexander Tsoy wrote: Hello Alexander, > Thanks! So SSL 2+ is indeed currently needs implicit feedback quirk. > The question is why it didn't help in your case. It didn't work because I was an idiot and used the wrong manufacturer ID. When I fixed that typo, the drift disappeared. Patch attached! [It's reasonable to assume that this will also work for the SSL2, but I don't know its ID: it might use the same ID as the SSL2+ or perhaps its 0x0001. Unfortunately I suspect we'll have to wait until one is observed in the wild to know.] Laurie diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 8a05dcb134..abf726c49f 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -367,6 +367,7 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, ifnum = 0; goto add_sync_ep_from_ifnum; case USB_ID(0x07fd, 0x0008): /* MOTU M Series */ + case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */ ep = 0x81; ifnum = 2; goto add_sync_ep_from_ifnum;
