Want to give a short feedback for other user waiting for a solution.
Thanks to Daniel the problem is solved now by the following patch:
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 379baad..b05111d 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -255,6 +255,13 @@ static int
Uroš Vampl wrote:
> Previous kernels had a static quirk
>
> SND_PCI_QUIRK(0x152d, 0x0729, "CTL U553W", ALC260_BASIC),
>
> which did the trick, but static quirks were removed in kernel 3.4.
The Realtek driver was rewritten to work correctly without quirks.
Well, in theory.
> what other info