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1b1ed1a
(Get the code!)
No regression saw here. I'm using Linux Libre kernel 3.10.1 X64.
I think it is a bad idea to connect an USB DAC through a HUB, though. Even a mouse gets choppy from time to time in spite of being the only thing on a HUB. The last time I did this I was still using Windows 7 and it didn't work for me either. After that I only use HUB for USB storage device.
I guess USB HUB is not ideal for real time purpose because it increases DPC Latency. And USB DACs are generally very sensitive to DPC Latency. There might be changes in the kernel about CPU frequency control that caused your problem, which is a different issue of what we had discussed on this page.