I have also experienced my Dell monitor not going into power save when connected with a mini DP to DP video cable to an ASUS z87-plus with a 4670 cpu running Win8. I swapped the DP cable for a DVI video cable and the problem stopped. It seems the common thing here is the video drivers since the problem occurs across multiple platforms using HDMI or DP cables. I will live with the DVI solution until a solution for this issue is found.
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