From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ken O'Brien Subject: Power measurement clarification Date: Tue, 28 Feb 2012 16:38:28 +0000 Message-ID: <4F4D0304.1050102@kenobrien.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-bk0-f46.google.com ([209.85.214.46]:47419 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964813Ab2B1Qic (ORCPT ); Tue, 28 Feb 2012 11:38:32 -0500 Received: by bkcik5 with SMTP id ik5so1433529bkc.19 for ; Tue, 28 Feb 2012 08:38:30 -0800 (PST) Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Greetings, In the ACPI spec there is a section (10.4) on power meters. Can someone clarify what these meters physically are? Are they external devices or onboard chips? If they're the latter, how can I detect them and read their data in userspace? Regards, Ken