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I just installed Lubuntu 13.04 on my MacBook Pro 6,2.

It seems to work fine. However, once in a while, when I am logged in and using the computer, the screen will suddenly become blank. (Sound still works -- I know this because one time the screen went blank when I was watching a video.)

Does anyone know what might be causing this? (I am using the NVIDIA driver.)

Edit: I have installed Lubuntu 12.04 to see if this would fix the problem; however, the unpredictable blank screen problem is still there.

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Have you checked xScreensaver settings? – Ahmadgeo Jun 8 '13 at 18:44
I don't think it's a problem with the screensaver settings, because: (1) Often, I am at the computer (typing on keyboard or clicking things with the mouse) when the screen goes blank. (2) If the screen went blank because of the screensaver, then I would be able to bring the screen back by moving the mouse. – Alan C Jun 9 '13 at 2:04

Please check the following instructions:

Note that GDM was replaced by LightDM.

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