From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Troller Subject: Re: Question about AthlonXP on nforce 2 : C2-C3 states Date: Sun, 5 Feb 2006 15:37:42 +0100 Message-ID: <20060205143742.GA20815@tangens.sinus.cz> References: <20060205152120.1688bd7b.arthur.huillet@agoctrl.org> Reply-To: Pavel Troller Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from tangens.sinus.cz ([195.39.17.8]:49624 "EHLO tangens.sinus.cz") by vger.kernel.org with ESMTP id S1750856AbWBEOiO (ORCPT ); Sun, 5 Feb 2006 09:38:14 -0500 Content-Disposition: inline In-Reply-To: <20060205152120.1688bd7b.arthur.huillet@agoctrl.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Arthur Huillet Cc: linux-acpi@vger.kernel.org > Hello, > > I've recently discovered that my system didn't seem to go into C2/C3 states. In fact, they're not > even recognized : > > # cat /proc/acpi/processor/CPU0/info > processor id: 0 > acpi id: 0 > bus mastering control: no > power management: no > throttling control: no > limit interface: no > > # cat /proc/acpi/processor/CPU0/power > active state: C1 > max_cstate: C8 > bus master activity: 00000000 > states: > *C1: type[C1] promotion[--] demotion[--] latency[000] usage[00000000] > > Would you happen to know why the Cx states are not seen ? Also, isn't there supposed to be bus > mastering control available ? > My mainboard is a Asus A7N8X rev 1.xx (nforce2). > The kernels I tried with no success in whatever case are 2.4.29 and 2.6.15.2. > Unfortunately, google doesn't seem to know much about this problem... > Hi! Please try to do something like this: root@porygon:~/# cat /proc/acpi/fadt |acpitbl |grep P_LVL P_LVL2_LAT: 190 P_LVL3_LAT: 1900 If you will see more than 100 in the first line and more than 1000 in the second one, your Cx states are blocked by BIOS. My example is from ASUS A7V8X, which may be similar. With regards, Pavel Troller