kern/52572: USB KVM not detected when attached to USB2 port on USB3 system

[mpumford%trigati.mudcovered.org.uk@localhost]

>Number:         52572
>Category:       kern
>Synopsis:       USB KVM not detected when attached to USB2 port on USB3 system
>Confidential:   yes
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 25 19:35:00 +0000 2017
>Originator:     Mike Pumford
>Release:        NetBSD 8.0_BETA
>Organization:
	
>Environment:
	
	
System: NetBSD trigati.mudcovered.org.uk 8.0_BETA NetBSD 8.0_BETA (GENERIC) #5: Sat Sep 16 20:22:01 BST 2017 builder%trigati.mudcovered.org.uk@localhost:/work/netbsd/8-stable/obj.amd64/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
      My USB 2 KVM is not detected when plugged into my NetBSD/amd64 system 
      with xhci when plugged into one of the motherboard USB2 ports. This
      port is still managed by xhci. The same system running NetBSD 7.1 with
      xhci WILL detect the KVM and devices attached to it.
>How-To-Repeat:
      Plug KVM into USB2 port and the following lines will appear in dmesg:
uhub6 at uhub1 port 5: ATEN International (0x557) product 8021 (0x8021), class 9/0, rev 1.10/1.00, addr 2
uhub6: 4 ports with 4 removable, self powered
uhub6: device problem, disabling port 1

Same device in a USB3 port on the same machine or running 7-STABLE gets:
uhub6 at uhub3 port 2: ATEN International (0x557) product 8021 (0x8021), class 9/0, rev 1.10/1.00, addr 1
uhub6: 4 ports with 4 removable, self powered
uhidev0 at uhub6 port 1 configuration 1 interface 0
uhidev0: Microsoft (0x45e) MicrosoftM-BM-. 2.4GHz Transceiver v8.0 (0x745), rev 2.00/6.56, addr 2, iclass 3/1
ukbd0 at uhidev0: 8 Variable keys, 6 Array codes
wskbd0 at ukbd0: console keyboard, using wsdisplay0
uhidev1 at uhub6 port 1 configuration 1 interface 1
uhidev1: Microsoft (0x45e) MicrosoftM-BM-. 2.4GHz Transceiver v8.0 (0x745), rev 2.00/6.56, addr 2, iclass 3/1
uhidev1: 28 report ids
uhid0 at uhidev1 reportid 18: input=0, output=0, feature=1
uhid1 at uhidev1 reportid 22: input=4, output=0, feature=0
uhid2 at uhidev1 reportid 23: input=0, output=0, feature=1
ums0 at uhidev1 reportid 26: 5 buttons, W and Z dirs
wsmouse0 at ums0 mux 0
uhid3 at uhidev1 reportid 28: input=3, output=0, feature=0
uhidev2 at uhub6 port 1 configuration 1 interface 2
uhidev2: Microsoft (0x45e) MicrosoftM-BM-. 2.4GHz Transceiver v8.0 (0x745), rev 2.00/6.56, addr 2, iclass 3/0
uhidev2: 8 report ids
uhid4 at uhidev2 reportid 3: input=1, output=0, feature=0
uhid5 at uhidev2 reportid 4: input=1, output=0, feature=0
uhid6 at uhidev2 reportid 7: input=7, output=0, feature=0
uhid7 at uhidev2 reportid 8: input=1, output=0, feature=0
uhidev3 at uhub6 port 1 configuration 1 interface 3
uhidev3: Microsoft (0x45e) MicrosoftM-BM-. 2.4GHz Transceiver v8.0 (0x745), rev 2.00/6.56, addr 2, iclass 3/1
ums1 at uhidev3: 5 buttons and Z dir


>Fix:
    Unknown

>Unformatted: