From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: RE: [PATCH] amd76x_pm: C3 powersaving for AMD K7 Date: Thu, 02 Feb 2006 01:50:41 +0000 Message-ID: <1138845041.5557.20.camel@localhost.localdomain> References: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from [81.2.110.250] ([81.2.110.250]:29408 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1423052AbWBBBtb (ORCPT ); Wed, 1 Feb 2006 20:49:31 -0500 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Brown, Len" Cc: Tony Lindgren , Erik Slagter , Andrew Morton , Joerg Sommrey , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, arjan@infradead.org On Mer, 2006-02-01 at 20:35 -0500, Brown, Len wrote: > This endeavor is full of risk, and I would be extremely careful > about enabling features that the BIOS explicitly disabled -- > unless the hardware manufacturer publicly publishes > support for the feature, or the errata that you're working around. Folks had code that supported AMD76x by banging the hardware directly. On some AMD76x systems it caused corruption. Nobody AFAIK ever figured out if it was an errata (nothing obvious in the docs/errata list) or a bug in the code doing the banging on the chip or some other bit of hardware on the mainboard that needed extra handling. Alan