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I am running Ubuntu 13.04 as a guest in Virtualbox 4.2.14, on a Windows 8 host. When the Ubuntu goes to sleep while in full screen mode, I cannot wake it up. The screen does not respond to input at all. I first have to "Host + F" to get it into normal more before I can type in the password to enter. This is really annoying. Has anyone else experienced this and know how to resolve it? It happens in both 32 and 64 bit versions

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Yeah, that's why I disable useless screensavers in a guest first thing after install to let the host do the power-saving. See e.g.… – Takkat Jul 4 '13 at 14:24

Disabling the screen saver other power management features (turn off screen, sleep/suspend, etc.) is the only thing I have found that works. Not really a fix but it will keep the guest OS from locking up.

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