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0e1f616
(Get the code!)
"ALSA: usb-audio: fix invalid length check for RME and other UAC 2 devices"
This commit might had caused some USB DAC to produce jerky audio output. All kernel versions after linux kernel 3.5.0-26 won't work with my asychronous USB DAC, my synchronous USB DAC works fine with the new version, though. They were all working fine with linux kernel under 3.5.0-25. I had downgraded to 3.5.0-25 and it worked again. I reproduced this issue under Ubuntu 12.10 and 13.04 daily build. Please look into this problem before it go into the release of Ubuntu 13.04.