The following reply was made to PR usb/172937; it has been noted by GNATS.

From: Hans Petter Selasky <hsela...@c2i.net>
To: freebsd-usb@freebsd.org
Cc: Uffe Jakobsen <u...@uffe.org>,
 freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/172937: FreeBSD 9.1-RC2 usb3 port disconnects
Date: Wed, 24 Oct 2012 10:04:07 +0200

 On Sunday 21 October 2012 21:27:54 Uffe Jakobsen wrote:
 > >Number:         172937
 > >Category:       usb
 > >Synopsis:       FreeBSD 9.1-RC2 usb3 port disconnects
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       low
 > >Responsible:    freebsd-usb
 > >State:          open
 > >Quarter:
 > >Keywords:
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Sun Oct 21 19:30:01 UTC 2012
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Uffe Jakobsen
 > >Release:        FreeBSD 9.1-RC2
 > >Organization:
 > 
 > >Environment:
 > FreeBSD asus-u32u 9.1-RC2 FreeBSD 9.1-RC2 #0 r241106: Mon Oct  1 18:26:44
 > UTC 2012     r...@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC 
 > amd64
 > 
 > >Description:
 > Running FreeBSD 9.1-RC2 amd64 on an Asus U32U 13" Notebook with 2x USB3
 > port and 1x USB2 port produces strange disconnects of the equipment
 > connected to USB3.0 (blue connectors) ports.
 > 
 > Mouse and keyboard is connected through a hub. The scenario is the
 > following: suddenly mouse and keyboard stops working - looking at the hub
 > I can see that is disconnected - some seconds later the hub leds indicate
 > that it is connected and the keyboard and mouse works again for some
 > minutes. Some days the units cannot reconnect after lots of disconnects
 > and reboot seems to be the only option. Also connecting the keyboard and
 > mouse directly to the USB3 ports (without the hub) produces the problem.
 > Same equipment (keyboard, wireless mouse through hub) works without
 > problems on the single USB2.0 port on the same system.
 > 
 > usbconfig:
 > ugen0.1: <OHCI root HUB ATI> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps)
 > pwr=SAVE ugen1.1: <EHCI root HUB ATI> at usbus1, cfg=0 md=HOST spd=HIGH
 > (480Mbps) pwr=SAVE ugen2.1: <OHCI root HUB ATI> at usbus2, cfg=0 md=HOST
 > spd=FULL (12Mbps) pwr=SAVE ugen3.1: <EHCI root HUB ATI> at usbus3, cfg=0
 > md=HOST spd=HIGH (480Mbps) pwr=SAVE ugen4.1: <XHCI root HUB 0x1b21> at
 > usbus4, cfg=0 md=HOST spd=SUPER (5.0Gbps) pwr=SAVE ugen3.2: <ASUS USB2.0
 > WebCam 04G6200086K1AN1B70007KB> at usbus3, cfg=0 md=HOST spd=HIGH
 > (480Mbps) pwr=ON ugen2.2: <product 0x3304 vendor 0x13d3> at usbus2, cfg=0
 > md=HOST spd=FULL (12Mbps) pwr=ON ugen4.2: <Generic USB Hub ALCOR> at
 > usbus4, cfg=0 md=HOST spd=FULL (12Mbps) pwr=SAVE ugen4.3: <Dell USB
 > Keyboard Dell> at usbus4, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON ugen4.4:
 > <Microsoft Nano Transceiver v2.0 Microsoft> at usbus4, cfg=0 md=HOST
 > spd=FULL (12Mbps) pwr=ON
 > 
 > 
 > The only trace of the incidents can be found in dmesg:
 > 
 > dmesg boot messages containing usb (dmesg |grep -i usb)
 > 
 > ohci0: <AMD SB7x0/SB8x0/SB9x0 USB controller> mem 0xfeb4b000-0xfeb4bfff irq
 > 18 at device 18.0 on pci0 usbus0 on ohci0
 > ehci0: <AMD SB7x0/SB8x0/SB9x0 USB 2.0 controller> mem 0xfeb4a000-0xfeb4a0ff
 > irq 17 at device 18.2 on pci0 usbus1: EHCI version 1.0
 > usbus1 on ehci0
 > ohci1: <AMD SB7x0/SB8x0/SB9x0 USB controller> mem 0xfeb49000-0xfeb49fff irq
 > 18 at device 19.0 on pci0 usbus2 on ohci1
 > ehci1: <AMD SB7x0/SB8x0/SB9x0 USB 2.0 controller> mem 0xfeb48000-0xfeb480ff
 > irq 17 at device 19.2 on pci0 usbus3: EHCI version 1.0
 > usbus3 on ehci1
 > xhci0: <XHCI (generic) USB 3.0 controller> mem 0xfe900000-0xfe907fff irq 18
 > at device 0.0 on pci5 usbus4 on xhci0
 > usbus0: 12Mbps Full Speed USB v1.0
 > usbus1: 480Mbps High Speed USB v2.0
 > usbus2: 12Mbps Full Speed USB v1.0
 > usbus3: 480Mbps High Speed USB v2.0
 > usbus4: 5.0Gbps Super Speed USB v3.0
 > ugen0.1: <ATI> at usbus0
 > uhub0: <ATI OHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
 > ugen1.1: <ATI> at usbus1
 > uhub1: <ATI EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
 > ugen2.1: <ATI> at usbus2
 > uhub2: <ATI OHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus2
 > ugen3.1: <ATI> at usbus3
 > uhub3: <ATI EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus3
 > ugen4.1: <0x1b21> at usbus4
 > uhub4: <0x1b21 XHCI root HUB, class 9/0, rev 3.00/1.00, addr 1> on usbus4
 > ugen4.2: <Dell> at usbus4
 > ukbd0: <Dell Dell USB Keyboard, class 0/0, rev 1.10/3.01, addr 1> on usbus4
 > ugen3.2: <04G6200086K1AN1B70007KB> at usbus3
 > ugen2.2: <vendor 0x13d3> at usbus2
 > ubt0: <vendor 0x13d3 product 0x3304, class 224/1, rev 1.10/0.01, addr 2> on
 > usbus2
 > 
 > 
 > dmesg logging from disconnect followed by automatic reconnect a few seconds
 > later:
 > 
 > ugen4.2: <ALCOR> at usbus4 (disconnected)
 > uhub5: at uhub4, port 3, addr 1 (disconnected)
 > ugen4.3: <Dell> at usbus4 (disconnected)
 > ukbd0: at uhub5, port 2, addr 2 (disconnected)
 > ugen4.4: <Microsoft> at usbus4 (disconnected)
 > ukbd1: at uhub5, port 4, addr 3 (disconnected)
 > ums0: at uhub5, port 4, addr 3 (disconnected)
 > uhid0: at uhub5, port 4, addr 3 (disconnected)
 > ugen4.2: <ALCOR> at usbus4
 > uhub5: <ALCOR Generic USB Hub, class 9/0, rev 1.10/3.12, addr 1> on usbus4
 > uhub5: 4 ports with 4 removable, self powered
 > ugen4.3: <Dell> at usbus4
 > ukbd0: <Dell Dell USB Keyboard, class 0/0, rev 1.10/3.01, addr 2> on usbus4
 > kbd2 at ukbd0
 > ugen4.4: <Microsoft> at usbus4
 > ukbd1: <Microsoft Microsoft Nano Transceiver v2.0, class 0/0, rev
 > 2.00/6.34, addr 3> on usbus4 kbd3 at ukbd1
 > ums0: <Microsoft Microsoft Nano Transceiver v2.0, class 0/0, rev 2.00/6.34,
 > addr 3> on usbus4 ums0: 5 buttons and [XYZT] coordinates ID=26
 > ums0: 0 buttons and [T] coordinates ID=0
 > uhid0: <Microsoft Microsoft Nano Transceiver v2.0, class 0/0, rev
 > 2.00/6.34, addr 3> on usbus4
 > 
 
 Hi,
 
 Is your ALCOR HUB FULL speed?
 
 I know these HUBS have some problems, and you might want to try connecting 
 through another branded HUB.
 
 --HPS
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