Comment 26 for bug 522998

To help someone working on this on the community side. If you look in drivers/usb/host/xhci-pci.c you will find comments " suspend and resume implemented later" in structs hc_driver xhci_pci_hc_driver & xhci_pci_driver where there should be function pointers to functions so that it can suspend.

This is still an issue in 2.6.35 source. This patch though does seem to resolve the issue as it impliments the suspend functions. Though not sure how functional:

http://kerneltrap.org/mailarchive/linux-usb/2010/5/13/6260980