Pentium M undervolting and underclocking - Revision history

Ilakast: /* Tested frequencies/voltages */ fixed wiki formatting

2014-09-06T00:27:40Z

‎Tested frequencies/voltages: fixed wiki formatting

Akw at 23:02, 1 May 2013

2013-05-01T23:02:01Z

Akw: /* Initscript */

2012-02-07T20:39:43Z

‎Initscript

Xmw: /* Alternative 0: linux-phc */ updated Gentoo section

2010-11-07T18:25:40Z

‎Alternative 0: linux-phc: updated Gentoo section

Pierro78: /* Alternative 0: linux-phc */

2009-11-27T20:19:52Z

‎Alternative 0: linux-phc

Pierro78: /* Alternative 0: linux-phc */

2009-11-27T20:17:13Z

‎Alternative 0: linux-phc

KotCzarny: /* Tested frequencies/voltages */

2009-10-13T08:22:42Z

‎Tested frequencies/voltages

BDKMPSS: correct indentation and some minor changes on my reported values

2008-12-07T23:10:51Z

correct indentation and some minor changes on my reported values

KotCzarny: /* Tested frequencies/voltages */

2008-09-19T18:49:45Z

‎Tested frequencies/voltages

KotCzarny: /* Tested frequencies/voltages */

2008-09-15T22:38:49Z

‎Tested frequencies/voltages

@@ Line 162: / Line 162: @@
 Following values were obtained with: (running at the same time)
-<bash>
 nice -n19 glxgears &
 mplayer somedivx.avi &
 cd /usr/src/linux && make -j2
-</bash>
+}}
 * note1: for pre-Core Intel CPUs, VID is related to voltage (in mV) as follows: VID=(voltage-700)/16 (or: voltage=(VID*16+700) mV)
 * note2: when testing for stability you should pay attention to sound too, occasional distortions which disappear after bumping voltage a notch or two

@@ Line 77: / Line 77: @@
 ==== Configuration file ====
-<bash>
+<source lang="bash">
 # /etc/conf.d/undervoltage
@@ Line 90: / Line 90: @@
 # pentium-m banias 1,7GHz lowered voltages [ -208mV ]
 MOD_VTABLE="1276,1100,1020,908,796,748"
-</bash>
+</source>
 ==== Initscript ====

@@ Line 93: / Line 93: @@
 ==== Initscript ====
-<bash>
+<source lang="bash">
 #!/sbin/runscript
 # Copyright 1999-2005 Gentoo Foundation
@@ Line 124: / Line 124: @@
          fi
+}
-</bash>
+</source>
 == Alternative 3: another patch with user-space control ==

@@ Line 25: / Line 25: @@
 Note :<br>
-phc now has a gui (phctool) for easier configuration. They are in a gentoo overlay : http://bugs.gentoo.org/show_bug.cgi?id=283472
+PHC plus patches for >=2.6.35 kernel is in the Gentoo tree as [http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-power/phc-intel/ sys-power/phc-intel]. [http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-power/phc-k8/ sys-power/phc-k8] and the GUI [http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-power/phctool/ sys-power/phctool].
 == Alternative 1: patch with hard-coded voltages ==

@@ Line 25: / Line 25: @@
 Note :<br>
-phc and its gui (phctool) has a gentoo overlay : http://bugs.gentoo.org/show_bug.cgi?id=283472
+phc now has a gui (phctool) for easier configuration. They are in a gentoo overlay : http://bugs.gentoo.org/show_bug.cgi?id=283472
 == Alternative 1: patch with hard-coded voltages ==

← Older revision		Revision as of 20:17, 27 November 2009
Line 23:		Line 23:

	{{cmdroot\|echo '27 22 16 10 3' > /sys/devices/system/cpu/cpu0/cpufreq/phc_vids}}		{{cmdroot\|echo '27 22 16 10 3' > /sys/devices/system/cpu/cpu0/cpufreq/phc_vids}}
		+
		+	Note :<br>
		+	phc and its gui (phctool) has a gentoo overlay : http://bugs.gentoo.org/show_bug.cgi?id=283472

	== Alternative 1: patch with hard-coded voltages ==		== Alternative 1: patch with hard-coded voltages ==

@@ Line 144: / Line 144: @@
 | Pentium-M Banias || 1.7  || 1276,1100,1020,908,796,748
 |-
-| Pentium-M Dothan || 1.4 || 924,892,860,828,796,764,732,700
+| Pentium-M Dothan || 2.0 || 1084,940,844,764,748
 |-
 | Pentium-M Dothan || 1.86 || 1068,972,876,780,700
 |-
 | Pentium-M SL6F7  || 1.6  || 1196,1052,956,860,780,732
 |-
 | Pentium-M Dothan || 1.5 || 924,892,860,828,812,796,764,732,700
 |-
-| Pentium-M Dothan || 2.0 || 1084,940,844,764,748
+| Pentium-M Dothan || 1.4 || 924,892,860,828,796,764,732,700
 |}

@@ Line 13: / Line 13: @@
 There are several methods to control CPU voltage in Linux, and currently all of them require a patched kernel.
-==Alternative 0: linux-phc==
+== Alternative 0: linux-phc ==
 Use the [[linux-phc]] kernel patch. '''This is the recommended  method, as it is most generic and best supported.'''
@@ Line 55: / Line 55: @@
 Don't forget to disable <tt>CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI</tt>.
-==Alternative 2: patch with user-space control==
+== Alternative 2: patch with user-space control ==
 If you want to use the Ubuntu 2.6.15 Kernel, please have a look at this thread: http://ubuntuforums.org/showthread.php?t=146366
@@ Line 70: / Line 70: @@
 When applying this patch be sure to keep the "ACPI tables for decoding frequency pairs" option -- this patch only allows adjustment of the voltages for the normal clock speeds as reported by the ACPI table in the BIOS.  On some models (e.g., ThinkPad {{T43}}) this does not include all clock speeds supported by the processor.
-=Initscript=
+=== Initscript ===
 This is a Gentoo initscript for the patch from Gentoo-Wiki user "Bdz".
-=== Configuration file ===
+==== Configuration file ====
 <bash>
 # /etc/conf.d/undervoltage
@@ Line 89: / Line 89: @@
 </bash>
-=== Initscript ===
+==== Initscript ====
 <bash>
 #!/sbin/runscript
@@ Line 123: / Line 123: @@
 </bash>
-==Alternative 3: another patch with user-space control==
+== Alternative 3: another patch with user-space control ==
 The [http://avkrok.net/nw8240/centrino-voltages.diff centrino-voltages.diff] patch, written by Rickard Holmberg, also provides user-space control. See [http://avkrok.net/nw8240/ here] and [http://mailman.linux-thinkpad.org/pipermail/linux-thinkpad/2005-December/030772.html here] for usage.
-==Stress Testing==
+== Stress Testing ==
 This [[Undervolt Stress Testing Script|script]] illustrates a very conservative method to stress test your lowered voltage settings.
-==Tested frequencies/voltages==
+== Tested frequencies/voltages ==
 If you have done excessive testing with user defined frequencies (stable system for over a month).
@@ Line 170: / Line 170: @@
 | {{T42}} || Pentium-M Dothan (735) || 1.7 || 17:19 14:12 12:8 10:4 8:1 6:1
 |-
-| {{X31}} || Pentium-M Banias (1.4) || 1.4 || 14:32 12:30 10:23 8:16 6:5 (fairly conservative)
+| {{X31}} || Pentium-M Banias (1.4) || 1.4 || 14:35 12:32 10:25 8:20 6:10 (fairly conservative)
 |-
 | {{X32}} || Pentium-M Dothan (745) || 1.8 || 18:26 16:20 14:15 12:11 10:6 8:2 6:1

@@ Line 174: / Line 174: @@
 | {{X32}} || Pentium-M Dothan (745) || 1.8 || 18:26 16:20 14:15 12:11 10:6 8:2 6:1
 |-
-| {{X40}} || Pentium-M Banias LV (718) || 1.2 || 12:17 11:14 10:11 9:8 8:5 6:3
+| {{X40}} || Pentium-M Banias LV (718) || 1.2 || 12:18 11:15 10:12 9:9 8:6 6:3
 |-
 | {{X41T}} || Pentium-M Dothan LV (758) || 1.5 || 15:15 14:13 13:11 12:9 11:7 10:5 9:3 8:2 6:2