Re: Intel GemniLake xHCI connected devices can never wake up the system from suspend

[Mathias Nyman]

On 15.03.2018 06:40, Chris Chiu wrote:
> Hi,
>      I  have a ASUS AIO V222GA and another Acer Desktop XC-830 both
> have Intel CPU J5005 and they both hit the same problem. The XHCI
> connected USB keyboard/mouse can never wakeup the system from suspend.
> It reminds me that similiar thing happens on ApolloLake too which
> needs the XHCI_PME_STUCK_QUIRK to get it work. It's also mentioned in
> https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/pentium-celeron-n-series-spec-update.pdf
> page #14 for N-seris intel CPU. And I also find the same problem
> description in https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/silver-celeron-spec-update.pdf
> page #16 for J-series Intel CPU. Seems that they have different
> workaround so I can not simply apply XHCI_PME_STUCK_QUIRK to make it
> work.
>
>      Anyone can help here?

N-Series
CHP8: USB xHCI Controller May Not Re-Enter D3 State After a USB Wake Event
- needs XHCI_PME_STUCK_QUIRK in driver (sets bit 28 at offset 80a4)

Intel Pentium Silver N5000
Intel Pentium Silver J5005
Intel Celeron N4000 and N4100
Intel Celeron J4105 and J4005

USB xHCI Controller May Not Re-enter a D3 State After a USB Wake Even
Need to clear PME_EN bit of of the standard PCI PM_CSR register.
I think Linux does this anyway (clears enabling PME when reaching D0)
So if I remember correct there was no specific workaround needed for this.

what is the PCI ID of your xhci controller? (lspci -nn)

One other possible cause is that xHCI never reaches PCI device D3 suspend state during system suspend.
xHC can't generate PME# wake event from normal running PCI device D0 state.

PCI code in Linux will check with ACPI about the lowest possible D state when suspending,
If there is something missing from the xHCI entry in ACPI DSDT table it might select D0.
as the suspend state, causing wake failure.

Is there a BIOS update available for your ASUS and Acer?

-Mathias