The following reply was made to PR usb/175731; it has been noted by GNATS.

From: Hans Petter Selasky <hsela...@c2i.net>
To: freebsd-usb@freebsd.org
Cc: Norbert Koch <nk...@demig.de>,
 freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/175731: detaching USB keyboard freezes other USB keyboards
Date: Thu, 31 Jan 2013 15:23:34 +0100

 On Thursday 31 January 2013 15:03:03 Norbert Koch wrote:
 > >Number:         175731
 > >Category:       usb
 > >Synopsis:       detaching USB keyboard freezes other USB keyboards
 > >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:   Thu Jan 31 14:10:00 UTC 2013
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Norbert Koch
 > >Release:        9.0
 > >Organization:
 > 
 > >Environment:
 > FreeBSD  9.0-RELEASE-p3 FreeBSD 9.0-RELEASE-p3 #0: Thu Jan 24 16:31:49 CET
 > 2013    
 > root@entw-pr2.demig.intra:/usr/home/nk/src/kernel/src/sys/EMBEDDED_USBKBD_
 > ONLY  i386
 > 
 > >Description:
 > My kernel is compiled without support for atkbd. I only use USB keyboards.
 > 
 > Attaching is fine but when detaching, any of the keyboards - I tried up to
 > three - the other keyboards freeze. If I attach the keyboard again the
 > other keyboards unfreeze and work as before.
 > 
 > The problem has something to do with devd.
 > Detaching works without problems in single user mode or with devd not
 > running. As long as dev does not run *during* detaching things seem to be
 > ok too.
 > 
 > Commenting out usb keyboard related entries in /etc/devd.conf
 > or /etc/devd/usb.conf does not help.
 > Commenting out syscons_setkeyboard in /etc/rc.d/syscons does not help
 > either.
 > 
 > >How-To-Repeat:
 > Attach two USB keyboards.
 > Detach any of them.
 > The still connected keyboards freezes.
 > Reconnect other keyboard.
 > Both keyboards work.
 
 Hi,
 
 Is this with or without X11?
 
 Can you try 9-stable?
 
 --HPS
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