Update: Repeated or missed keys after upgrading from 6.2 to 7.0

Benjamin Close Benjamin.Close at clearchain.com
Wed Jan 2 02:16:54 PST 2008

Mike Silbersack wrote:
> On Mon, 24 Dec 2007, Mike Silbersack wrote:
>> In order to eat my own dog food, I upgraded my laptop from 6.2 to
>> 7.0. This seemed to have gone well, until I started writing a long
>> e-mail while sitting on the couch today.  As I was typing the e-mail,
>> I noticed that my typing skills seemed to have gone missing; there
>> were words missing 2-3 letters, and other places where I was
>> apparently holding down keyyyys. Heh, that's a real example of the
>> phenomenon right there.
>> After a while I realized that I was not typing sloppily, but that in
>> fact keys are being lost in certain cases and duplicated in others. 
>> Since I did not rebuild any ports or packages, I'm convinced that
>> this is directly related to the 7.0 upgrade.
>> This behavior has shown up when running a local copy of pine (inside
>> konsole), chatting in ksirc, and in a few other programs.  (I'm
>> running KDE.) I think it happens more when on battery than when
>> plugged into an outlet. I'm running xbattbar, so it could be querying
>> the battery status and causing problems.  This is using the laptop's
>> built-in keyboard (non-USB.)
>> I'm going to try to track this down, although I don't know how
>> successful I'll be.  I'd like to know if anyone else has seen this
>> problem and if they have any additional information that might help
>> me track it down faster.
>> Thanks,
>> Mike "Silby" Silbersack
> Thanks to everyone who responded to this thread.  Here's what I've
> learned since my initial message:
> 1.  Other people have seen this problem (or something similar) as far
> back as 5.x.
> 1a.  I noticed in my kernel config file that I did NOT have kdbmux in
> my 6.2 kernel config file, but I do have it in my 7.0 kernel config
> file. However, I also tried recompiling 7.0 without kbdmux, and the
> problem still occurs.
> 2.  The problem only happens when I have xbattbar running.  Whether or
> not I'm actually running on battery makes no difference.
> 3.  Ssh sessions into the box do not appear to be affected.
> 4.  If I plug in a USB keyboard, it does not seem to be affected. 
> (Either with or without kbdmux.)
> I've added some KTR debugging statements to try to help me track this
> down, but I have not yet made much progress.
    Does this only happen under X?
If so it may not be kernel related at all. Until recently Xorg had a bug:



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