To add some info, I am using the kubuntu desktop and experienced the
problems under kde.

I think I have found the cause of the reported problem now  - at least
with my setup.

It is some strange interaction with some kde usability features and some
bugs in related systems. There is some usabiltity feature calles 'sticky
keys' (IIRC), thus if you press a special key some seconds, this
'feature' get automagically enabled.

But sure enough, even with sticky keys, you should not get key press
event duplications. Even worse, at some stage with testing under sticky
keys, the X server terminated itself (str+alt+backspace was _not_
accidently pressed).

The kde 3 usability setup dialog is very strange (i.e. has not a high
usability (sic!)), thus I thought the usability features were disabled,
but they weren't 100%.  The consequence was, that sticky keys were
enabled, but no optical notification was shown on activation.

I can post some screenshots, that show the configuration dialog in that
usability-feature-pseudo-activated-state.

Thus, after making sure, that sticky keys are completely de-activated in
this strange configuration dialog the problem was fixed.

-- 
suddenly keyboard event recognition gets really slow
https://bugs.launchpad.net/bugs/227359
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