From mboxrd@z Thu Jan 1 00:00:00 1970 From: Manfred Langthaller Subject: Re: Can't lower vcore => "vid trans failed" Date: Mon, 18 Jun 2007 17:31:49 +0200 Message-ID: <4676A565.1060305@aon.at> References: <4676671D.30307@aon.at> <1449F58C868D8D4E9C72945771150BDF02076EAF@SAUSEXMB1.amd.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1449F58C868D8D4E9C72945771150BDF02076EAF@SAUSEXMB1.amd.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@lists.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=m.gmane.org+glkc-cpufreq=m.gmane.org@lists.linux.org.uk Content-Type: text/plain; charset="us-ascii"; format="flowed" To: "Langsdorf, Mark" Cc: cpufreq@www.linux.org.uk Langsdorf, Mark schrieb: >> Mainboard: MSI K8MM3-V H (MSI-7181 Ver: 2.0) BIOS v3.1 (latest) >> CPU: AMD mobile Sempron 3000+ (SMS3000BQX2LF, TDP 25W) >> Debian 4.0 >> Kernel: 2.6.21.5 >> >> If I insert module powernow-k8 3 P-States are recognized, but the >> voltages are too high. >> >> powernow-k8: Found 1 Mobile AMD Sempron(tm) Processor 3000+ >> processors >> (version 2.00.00) >> powernow-k8: 0 : fid 0xa (1800 MHz), vid 0xa >> powernow-k8: 1 : fid 0x8 (1600 MHz), vid 0xc >> powernow-k8: 2 : fid 0x0 (800 MHz), vid 0x13 >> powernow-k8: ph2 null fid transition 0xa >> >> 0: VID = 0xa = 01010 = 1.3V >> 1: VID = 0xc = 01100 = 1.250V >> 2: VID = 0x13 = 10011 = 1.075V > > These voltages are consistently 0.1V above minimum specification, > but your laptop motherboard may have needed some margin. If you > mess with them, you may have problems while transitioning. As > you've noticed. > >> Now after inserting module powernow-k8 dmesg says: >> >> powernow-k8: Found 1 Mobile AMD Sempron(tm) Processor 3000+ >> processors >> (version 2.00.00) >> powernow-k8: 0 : fid 0xa (1800 MHz), vid 0x13 => 1.075V >> powernow-k8: 1 : fid 0x8 (1600 MHz), vid 0x16 => 1.000V >> powernow-k8: 2 : fid 0x0 (800 MHz), vid 0x1d => 0.825V >> powernow-k8: ph2 null fid transition 0xa > > vid at 1800 MHz should be 1.2V (0xe) > vid at 1600 MHz should be 1.15V (0x10) > vid at 800 MHz shoul dbe 0.975V (0x17) > > I don't know why you think you can operate at 0.825V but it's > not a supported frequency on the data sheet. > >> powernow-k8: vid trans failed, vid 0x1d, curr 0x13 >> powernow-k8: transition frequency failed >> Time: acpi_pm clocksource has been installed. >> Clocksource tsc unstable (delta = -277822049 ns) >> (appending nohz=off highres=off to the kernel should fix the >> clocksource >> error) >> >> All in all the vcore cannot be set lower than 0x13, even 0x13 >> at 1800MHz works perfectly. >> >> Where is the problem? >> Is it the board, the kernel, or me? > > Your revised ACPI table is more than a little strange. > > -Mark Langsdorf > Operating System Research Center > AMD > > > Hi Mark & Thanks a lot! First of all, it's a desktop board and I'm just playing around ;-) Second I searched for a datasheet but did'n find one. Thank you for clarification! Have a nice day, Manfred