Getting this xhci_hcd fail or slow boot more so down to the cause, I've
been debugging enabling power-on via keyboard/mouse, and again this
xhci_hcd fail showed-up after, not when enabling ErP setting (below
power-on via keyboard/mouse settings), but merrily toggling the ErP
enable/disable option within BIOS/EFI screen and then rebooting/power
cycling.  ErP (Energy-Related Products) mode is somewhat directly
related with powering on via keyboard/mouse.  What's exactly transpiring
here I do not know, as BIOS/EFI settings tend to be elusive, especially
when the settings modify other values on another BIOS/EFI screen or
settings not displayed.

Likely a PCI(E), in this case an xhci_hcd (USB bus) device, is having
problems waking after power-off due to either ASPM/ErP?  If this is the
case recommendations else where suggest disabling ASPM and/or ErP.

NOTE: Fast/Ultra-fast boot BIOS/EFI settings also provides further
refinement for waking via keyboard/mouse, so some settings might be
intermingling with ErP, and maybe ASPM.  Since BIOS/EFI documentation
nowadays (in my case Gigabyte) is significantly increasingly lacking,
can only guess based on how the PC boots?

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https://bugs.launchpad.net/bugs/1749961

Title:
  xhci_hcd: TRB DMA errors reported with ASMedia ASM1142 USB 3.1
  Controller

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