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kern/56050: xhci suspend/resume is unimplemented

>Number:         56050
>Category:       kern
>Synopsis:       xhci suspend/resume is unimplemented
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 10 08:10:00 +0000 2021
>Originator:     nia
>Release:        NetBSD 9.99.80
NetBSD r 9.99.80 NetBSD 9.99.80 (GENERIC) #0: Fri Mar  5 20:30:56 UTC 2021 amd64

Attempt to suspend laptop with USB3 (in this case, lenovo x250). USB ports no longer function after successful resume.
xhci_resume and xhci_suspend should probably not be stub functions.

There is an XXX in xhci.c where UHF_PORT_SUSPEND should be handled.

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