Comment 23 for bug 1419355
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bbfa235
(Get the code!)
I tested on the bad kernel(Debian experimental kernel: 3.12-trunk-amd64), "modprobe -r xhci_hcd" before shutdown, problem is still there; "setpci -s 00:14.0 CAP_PM+4.b=08" doesn't work; combine "modprobe -r xhci_hcd" and "setpci -s 00:14.0 CAP_PM+4.b=08" doesn't work too.
And, I found both cases in this bug are related to ASRock motherboard, "asrock h87 pro4" of Giorgos aka shad0w and "asrocofficiallyk z87 pro3" of mine. So, is it a motherboard design or motherboard BIOS bug? The BIOS version is newest of my motherboard.
As Takashi Iwai said: "this should be a rare case, so we may ignore for now...", if both Linux kernel and Asrock think this is a rare case(for this asrock motherboard, they support Windows officially, so Linux user is a rare case). Then, the common user will get a unnormal system.