Comment 77 for bug 1419355

The upstream change listed by Michael Korn covers Renesas xHCI controllers on any chipset and HP controllers on Lynxpoint chipsets.

Kernel 3.13 is marked EOL at kernel.org as of 2014-04-22, so Ubuntu will probably have to deal with the backport at the distribution level. In this case, the backport would be pretty trivial.

@Tobias Theobald: the problem seems to be that the BIOS powers up the xHCI controller before the OS is booted up, but won't power it down properly if the OS does not do that at shutdown. If you don't load the xhci-hcd module at all, the system will definitely suffer from this issue as the code to apply the quirk is within the module.

I'm attaching a modified version of Marcus Husar's patch, to cover both my Asus and his Lenovo systems with Ivy Bridge+PPT.