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After my Kubuntu wakes up from sleep mode, the screen is grey and the only thing I can do is to turn power off. I can't even go to console using Ctrl+Alt+F1. How to make wake-up work correctly? It works correctly on Win7 installed on the other partition. I'm using laptop.

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Are you using a laptop or a desktop? –  criziot Jun 23 '12 at 13:29
@criziot laptop –  burtek Jun 23 '12 at 16:22
Please try to increase/decrease screen luminosity. –  criziot Jun 23 '12 at 17:18
@criziot Luminosity is not the problem here. In fact whatever key I press, there is no change on the screen. –  burtek Jun 23 '12 at 20:26
When my laptop wakes up from sleep the screen backlight stays off untill I press luminosity buttons and I have Ubuntu. That's why I've asked you to try it. –  criziot Jun 23 '12 at 20:51

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