I've left plenty of comments on the question since there were multiple theoretical answers deleted. Here they are:
I've also had to remove 2 answers which were theoretical in nature. The point of this question is to know whether the EM radiation changes and in which direction (increase, decrease). We all know that there are power saving features. The point is whether this has any noticeable effect based on the plugged in/plugged off variable. In other words, the mechanism by which this claim could be true is secondary. First you need to establish there is an effect, otherwise any explanation is pure fantasy. – Sklivvz♦ yesterday
Moderation note: we've left time and asked the OPs of those questions to fix, but once multiple theoretical answers started to appear and comments started degenerating into a theoretical debate, we decided to delete the posts until they are fixed. We understand deletion is never a good experience and apologise in advance for that, but the site has specific rules for answers which need to be enforced. – Sklivvz♦ yesterday
Since this question seems to attract a lot of theoretical answers (at least 6 so far), further theoretical answers will be deleted more quickly. – Sklivvz♦ yesterday