This is a note to let you know that I've just added the patch titled ALSA: usb-audio: Add implicit feedback quirk for UR22C to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: alsa-usb-audio-add-implicit-feedback-quirk-for-ur22c.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7c5b892e0871655fea3294ffac6fa3cc3400b60d Mon Sep 17 00:00:00 2001 From: Joshua Sivec <sivec@xxxxxxxxxx> Date: Tue, 25 Aug 2020 18:55:18 +0200 Subject: ALSA: usb-audio: Add implicit feedback quirk for UR22C From: Joshua Sivec <sivec@xxxxxxxxxx> commit 7c5b892e0871655fea3294ffac6fa3cc3400b60d upstream. This uses the same quirk as the Motu and SSL2 devices. Tested on the UR22C. Fixes bug 208851. Signed-off-by: Joshua Sivec <sivec@xxxxxxxxxx> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=208851 Cc: <stable@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200825165515.8239-1-sivec@xxxxxxxxxx Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/usb/pcm.c | 1 + 1 file changed, 1 insertion(+) --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -356,6 +356,7 @@ static int set_sync_ep_implicit_fb_quirk case USB_ID(0x07fd, 0x0008): /* MOTU M Series */ case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */ case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */ + case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */ case USB_ID(0x0d9a, 0x00df): /* RTX6001 */ ep = 0x81; ifnum = 2; Patches currently in stable-queue which might be from sivec@xxxxxxxxxx are queue-5.4/alsa-usb-audio-add-implicit-feedback-quirk-for-ur22c.patch