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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 7 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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