I see the same problem with 2 different m/b:
Asus X99-A and Asus Z97-A
I can see the problem with Kernels 3.16 and 3.19.

Does anyone have a work-around, such as changing USB parameters in the
BIOS?

I also see that a complete power down temporarily fixes the issue.

Also woth noting: my Z97-A system has a dual-boot (Ubuntu/Windows). When I boot 
Windows after having been in Ubuntu, Windows has the same issue: it seems 
frozen for about 30s when booting.
But when I do a cold boot in Windows, and only reboot in Windows, I don't see 
the problem.

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https://bugs.launchpad.net/bugs/1437492

Title:
  boot stalls on USB detection errors

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