From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Lincoln Baxter, III" Subject: Re: HP nc6400 v.03 or v.05 laptop ACPI fails after reboot, works again after booting windows Date: Fri, 15 Dec 2006 17:35:37 -0500 Message-ID: <45832339.3050307@gmail.com> References: <457F37C0.3090003@gmail.com> <1165966936.29844.37.camel@pcjc2lap> <457FB1A1.2030602@gmail.com> <1166012707.22903.4.camel@pcjc2lap> <4582A607.8040302@gmail.com> <1166191807.7459.16.camel@pcjc2lap> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from wx-out-0506.google.com ([66.249.82.239]:36936 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750896AbWLOWfk (ORCPT ); Fri, 15 Dec 2006 17:35:40 -0500 Received: by wx-out-0506.google.com with SMTP id h27so795799wxd for ; Fri, 15 Dec 2006 14:35:39 -0800 (PST) In-Reply-To: <1166191807.7459.16.camel@pcjc2lap> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Update: Kernel 2.6.18-r4 I've done some more testing, and I've narrowed the problem down to the "processor" cpu driver. I disabled all power management features in the kernel, and compiled ACPI as modules so that they would not be loaded until I wanted them to be. APM is off. CPU Frequency Scaling is off. ACPI is compiled entirely as modules to be loaded by the user. While running on the battery: As soon as I "modprobe processor" the humming begins, and as soon as I "rmmod processor" the humming stops. While running on AC, if I "modprobe processor" there is no buzzing. I can remove the AC adapter and the computer remains silent. It seems to be something related to the way that the processor driver is handling power to the CPU. Ideas?