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,
 bug-follo...@freebsd.org
Cc: x...@freebsd.org
Subject: usb/175731: detaching USB keyboard freezes other USB keyboards
Date: Mon, 11 Feb 2013 11:26:08 +0100

 On Thursday 07 February 2013 22:40:01 Hans Petter Selasky wrote:
 > The following reply was made to PR usb/175731; it has been noted by GNATS.
 > 
 
 Hi,
 
 You should look into HAL and xf86-input-keyboard ports. I don't have time to 
 debug this currently.
 
 To prevent KBD X11 driver unload by /usr/ports/x11-drivers/xf86-input-keyboard 
 change this in the source code:
 
  {
 -    xf86AddInputDriver(&KBD, NULL, 0);
 +    xf86AddInputDriver(&KBD, module, 0);
  
      return module;
  }
 
 The problem is deeper. When X11 sees that the keyboard is gone it 
 issues some IOCTLs on /dev/console, like the keyboard MODE and then no more 
 keys are received. See using ktrace on Xorg. This is a shared device receiving 
 key-presses for all keyboards as far as I can see and it should only be 
 programmed once. This is currently not handled.
 
 Inside the file referenced below code is present to set "x11_driver" to "kbd". 
 Probably changing this will affect the outcome too:
 
 /usr/local/share/hal/fdi/policy/10osvendor/10-x11-input.fdi
 
 How to reproduce:
 
 Plug two USB keyboards using a HAL enabled Xorg server. Unplug one keyboard. 
 Input from the other keyboard disappears until some other keyboard device is 
 plugged again!
 
 --HPS
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