Found something interesting here http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/desktop-6th-gen-core-family-spec-update.pdf SKL083 - The Processor May Fail to Properly Exit Package C6 or Deeper Maybe microcode disables such states because of this bug?
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SKL083 - The Processor May Fail to Properly Exit Package C6 or Deeper
Maybe microcode disables such states because of this bug?