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[ubuntu] Flashing corners of screen

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http://ubuntuforums.org – Hi, I have a strange problem, the corners of the screen are 'blinking'. It's not completely going dark, but it seems like my screen has a too low refresh rate (although it's set to 60HZ and it's the only one available). It's really annoying, but the special thing about it is that it only occurs when the screen went dark (when I'm AFK for example) or when I shut the laptop screen and open it up again. It's a dual boot SONY VAIO VPCEB2Z1E with Windows 7 on it, and this never happens with Windows. Yes I have tried installing the extra drivers but that didn't help neither. I have also connecte (Hardware)