Hi! To better help you with the problem, please answer the following questions 
aside from what's asked above:
1. How did you set the screensaver and what are the settings?
2. Do you have a specific screensaver to be activated?

I have my machine set to have blank screen after an hour of idleness.
Checked the Lock screen when screensaver is active, which will require
me to enter my password to activated desktop again for use.

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Whenever the computer goes to sleep, hibernate, or any other screensaver 
activating action, the computer frozes on a black screen.
https://bugs.launchpad.net/bugs/550132
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