Dropped USB keyboard events

Tom Judge tom at tomjudge.com
Wed Mar 21 20:39:54 UTC 2007

Chris Jones wrote:
> Hi folks--
> I recently installed my first FreeBSD workstation after many years with 
> NetBSD exclusively. Overall, I'm happy; but I'm seeing one particularly 
> irritating bug.
> At seemingly random intervals, the computer seems to stop listening for 
> keyboard events for as long as a second at a time. Though I'm no speed 
> demon at the keyboard, this can mean a few keystrokes that go missing 
> before the computer catches up with me. Sometimes when it catches up, it 
> will get a key which I pressed during the hiatus; and sometimes it will 
> duplicate the last key I pressed before it stopped paying attention.
> I've tried swapping to a different USB keyboard. I've tried plugging the 
> keyboard in directly to the USB port, instead of via hubs. I've tried 
> console mode instead of X. In all cases, the strange behavior is still 
> present.
> I'm using FreeBSD 6.2-RELEASE on a Dell Latitude D620 laptop. Here are 
> the many lines of USB-relevant output from dmesg:


> I'd appreciate any advice on getting my lost keystrokes back.
> Chris

I have seem similar problems with some PS2->USB converters that we where 
planning to use with some new servers.  It is almost like the Key Up 
event is being lost as keys will appear to be stuck down an repeat until 
the key is pressed again and the system recognises the key up.  I have a 
large number of these adapters that I would like to use any 
fix/information would be great.  I can provide any information that 
anyone would like to be able to diagnose this problem.


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