kern/52915: USB keyboard attached via xhci does not work in ddb(4)

[paul%whooppee.com@localhost]

>Number:         52915
>Category:       kern
>Synopsis:       USB keyboard attached via xhci does not work in ddb(4)
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 09 02:50:00 +0000 2018
>Originator:     Paul Goyette
>Release:        NetBSD 8.99.7
>Organization:
+------------------+--------------------------+----------------------------+
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:          |
| (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee dot com   |
| Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd dot org |
+------------------+--------------------------+----------------------------+
>Environment:
	
	
System: NetBSD speedy.whooppee.com 8.99.7 NetBSD 8.99.7 (SPEEDY 2017-11-29 22:03:05 UTC) #0: Wed Nov 29 23:14:50 UTC 2017 paul%speedy.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64
Architecture: x86_64
Machine: amd64
>Description:
Keyboard attached via xhci (USB3) does not work in ddb(4).
	
>How-To-Repeat:
1. Get a system with xhci interface, and connect the keyboard to a USB3 port
2. Boot with -d option, or make your kernel panic with ddb.onpanic set to
   a positive value.
3. At the db prompt, try to type a command.  Nothing echos.
	
>Fix:
	

>Unformatted: