There a lot information which could help here ;-)
What version of Kubuntu?
What version of KDE?
What version of the xserver-xorg package?
What graphics driver/chip?
Do you use any kind of 3D effects on your desktop?
** Changed in: kdebase (Ubuntu)
Status: New => Incomplete
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KDE screen stays blank/black after some idle time
https://bugs.launchpad.net/bugs/277322
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