Comment 14 for bug 1534856

This seems to be a regression specifically with the C-Media USB Audio chipset. At least C-Media CM6632 and CM6631A are affected:
http://article.gmane.org/gmane.linux.usb.general/136685

Unfortunately I have not been able to find an older Ubuntu kernel where this works yet. But I can at least confirm the following kernels all contain the problem:

3.5.0-17.28
3.7.0-0
3.9.0-generic
3.10.0-generic
3.12.0-2-generic
3.12.0-4-generic
3.13.0-24-generic
3.13.0-30-generic
3.13.0-40-generic
3.13.0-51-generic
3.13.0-76-generic
4.2.0-25-generic
4.4
4.5-rc1
4.5-rc2

I will continue testing older kernels.