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Actually, I suspect the computer is waking up but my external monitor won't display anything (it turns on the backlight but screen remains black).

I end up having to open the lid of the laptop for display to turn on, then I have to close lid again.

I'm using VGA port on a T430 thinkpad

  • Same behavior here on several different laptops, with external monitors connected via display port. The problem begins after the external monitor was disconnected for a moment. If it is continuously connected since boot the problem does not appear. – user18908 Sep 3 at 8:48

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