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After installing Gentoo base system (no GUI or even X.org is installed yet) the screen blanks for about a second once in a while when the system is idle. After I set precise interval via setterm -blank 1 I found out that setterm successfully blanks the screen after the given interval but apparently something wakes it up immediately.

Any idea on what should be fixed or what logs should I dig into to figure out what's actually going on?

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Perhaps the gpm daemon registers tiny mouse movements? –  Ярослав Рахматуллин Nov 29 '12 at 22:56
Might be. However once in X session, everything works fine. So I might not dig into it. –  zoresvit Dec 1 '12 at 8:27

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