Black Screen after start KDE from sleep mode

Hai everyone,
i just press sleep in start menu in KDE, but when i start again i can't see prompt password and i just see black screen.
please help me.
Sorry for my bad English, because English not my native language.
thank you.

i think its being discussed in here
https://bbs.archlinux.org/viewtopic.php?id=159379

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