Its the "slow keys" feature of KDE, also reported in Bug #41427. Get rid
of it by disabling it (accessibility/keyboard filters).
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KDE / Kubuntu does not respond for keyboard
https://bugs.launchpad.net/bugs/69969
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Team, which
Confirmed, spent a few hours on figuring that out. Although googling
"kde keyboard problem" helped a lot. Still a very confusing and probably
unnecessary feature.
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"slow keys" can turn on surreptitiously & cause confusion.
https://bugs.launchpad.net/bugs/41427
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Any chance for a patch for 2.6.17-11?
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CPU soft lockup during bootup
https://launchpad.net/bugs/63418
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