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All three of these modes seem to have the same effect on my display. Same blanking and waking time. Are there any differences in power consumption or something else?

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up vote 12 down vote accepted

On an LCD display, there is probably no difference between the different DPMS modes, which are really specified for CRTs.

From Saving Power on idle PCs:

… for an LCD display there is often no difference between standby, suspend, and off.

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Thanks, didn't expect someone answers the question after so long. – user713303 Jun 8 '12 at 12:56

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