Post [Q] CM 10.2 black lockscreen

Hi. I have a problem with unlock my phone. Very often when i try to do that the LCD is black but buttons shine normaly. Especially when i unlock by home button. I need to do it few times then everything is normal. The software is a new CM 10.2 by TC. I don't remember from which compilation it is. I even return to stock then flash CM but it doesn't change anything. All wipes are done everytime. My screen driver is s26.

Is there any chance to resolve a problem?

Sorry for a language...