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ubuntu 12.04 returns to login screen on resume from suspend. Is there a fix?

When I resume from a suspend, Ubuntu 12.04 will come back ok for about 10 seconds, and then the screen blanks out. After about another second or so, it returns to the login screen for Unity 2d. It ...
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Hang during unlock, slow after that

I have problems when I leave computer on during the night, when I resume it in the morning, it becomes very slow, I often wait for few minutes until login form renders, when I login, apps freeze ...