Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755269Ab0BSRBh (ORCPT ); Fri, 19 Feb 2010 12:01:37 -0500 Received: from kroah.org ([198.145.64.141]:57819 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754916Ab0BSRBM (ORCPT ); Fri, 19 Feb 2010 12:01:12 -0500 X-Mailbox-Line: From gregkh@kvm.kroah.org Fri Feb 19 08:32:54 2010 Message-Id: <20100219163254.013659746@kvm.kroah.org> User-Agent: quilt/0.48-4.4 Date: Fri, 19 Feb 2010 08:30:16 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Arjan van de Ven , Len Brown Subject: [83/93] ACPI: fix High cpu temperature with 2.6.32 In-Reply-To: <20100219165717.GA15002@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2207 Lines: 58 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Arjan van de Ven commit 370d5cd88509b93b76eb2f5f97efbd71c25061cb upstream. Since the rewrite of the CPU idle governor in 2.6.32, two laptops have surfaced where the BIOS advertises a C2 power state, but for some reason this state is not functioning (as verified in both cases by powertop before the patch in .32). The old governor had the accidental behavior that if a non-working state was chosen too many times, it would end up falling back to C1. The new governor works differently and this accidental behavior is no longer there; the result is a high temperature on these two machines. This patch adds these 2 machines to the DMI table for C state anomalies; by just not using C2 both these machines are better off (the TSC can be used instead of the pm timer, giving a performance boost for example). Addresses http://bugzilla.kernel.org/show_bug.cgi?id=14742 Signed-off-by: Arjan van de Ven Reported-by: Signed-off-by: Andrew Morton Signed-off-by: Len Brown Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/processor_idle.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -110,6 +110,14 @@ static struct dmi_system_id __cpuinitdat DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"), DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")}, (void *)2}, + { set_max_cstate, "Pavilion zv5000", { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")}, + (void *)1}, + { set_max_cstate, "Asus L8400B", { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), + DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")}, + (void *)1}, {}, }; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/