From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: [Resend][PATCH] ACPI / PM: Do not power manage devices in unknown initial states Date: Fri, 01 Feb 2013 22:44:55 +0100 Message-ID: <6427459.8Ia2IB77g6@vostro.rjw.lan> References: <3676077.i6vcpp7Nrn@vostro.rjw.lan> <2135454.ENo8eA9AXp@al> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7Bit Return-path: Received: from hydra.sisk.pl ([212.160.235.94]:40901 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757562Ab3BAVin (ORCPT ); Fri, 1 Feb 2013 16:38:43 -0500 In-Reply-To: <2135454.ENo8eA9AXp@al> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Peter Wu Cc: ACPI Devel Maling List , LKML , Len Brown , Mika Westerberg On Friday, February 01, 2013 07:23:52 PM Peter Wu wrote: > On Thursday 31 January 2013 23:32:40 Rafael J. Wysocki wrote: > > In general, for ACPI device power management to work, the initial > > power states of devices must be known (otherwise, we wouldn't be able > > to keep track of power resources, for example). Hence, if it is > > impossible to determine the initial ACPI power states of some > > devices, they can't be regarded as power-manageable using ACPI. > > > > For this reason, modify acpi_bus_get_power_flags() to clear the > > power_manageable flag if acpi_bus_init_power() fails and add some > > extra fallback code to acpi_bus_init_power() to cover broken > > BIOSes that provide _PS0/_PS3 without _PSC for some devices. > > > > Verified to work on my HP nx6325 that has this problem. > > > > Signed-off-by: Rafael J. Wysocki > > Tested-by: Peter Wu > > I applied it on top of branch linux-next of repo linux-pm. > > Fixes the issue I had with bbswitch in Linux 3.8. Can a backport patch be made > available for 3.8? Yes, after this commit enters the mainline. Please ping me some time around 3.9-rc1. Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.