Arch Linux

burmmo

Member

Registered: 2008-06-23

Posts: 12

Undervolting Laptop Pentium M 1.7ghz

Hi there
last month my sister give me this laptop and i knew it kinda old for now where dual core laptop everywhere but i am so thankful to receive my first laptop which are currently much faster than my desktop pc (pentium 3 700mhz).It is much faster than my pc and help in my school work:D

here my problem i am thinking of undervolting this laptop but i dont how to start:| i use Windows XP before and it is easy just by using Notebook Hardware Control and i can undervolt this laptop plus controlling its speedstep.

here the spec
Hp Dv1000 laptop

Pentium M 1.7ghz
512mb ddr1 ram
intel 915gm graphic
coxenant audio
Intel 2200bg wireless
realtek 8139 lan

i type this in the konsole "uname -r"

2.6.25-ARCH

is there a fast way to undervolt the laptop like Windows XP NHC

Last edited by burmmo (2008-06-23 21:01:35)

vogt

Member

From: Toronto, Canada

Registered: 2006-11-25

Posts: 389

Re: Undervolting Laptop Pentium M 1.7ghz

Hi. frequency scaling will definietly reduce power usage and heat.

Undervolting is less common, since you risk instability, and it doesn't look like acpi in the vanilla kernel has the required patches mentioned here.

A pkgbuild for an acpi module (phc) that can change voltages is here: http://aur.archlinux.org/packages.php?ID=17884. So build and load the acpi-cpufreq-phc module (whatever it ends up being called), then change the voltages like method 0 in the thinkwiki article.

or this gui: http://aur.archlinux.org/packages.php?ID=17059

Check out archlinux's wiki for how to make and install a package built from a PKGBUILD (and its required files).

Last edited by vogt (2008-06-24 00:32:55)

burmmo

Member

Registered: 2008-06-23

Posts: 12

Re: Undervolting Laptop Pentium M 1.7ghz

thanks for the help:) i 'm back to Archlinux again after using Winxp this week.This time i guess i want to spend a little more with Arch

one thing that hold me this while is the undervolt thinggy:( My laptop will instantly auto shudown when longer under load and this happen frequently in Arch but when in Windows Xp it less frequent and more stable after undervolting the cpu.i hate how Hp implement this laptop bios and there is no way i can control the fan speed and voltage:(

A pkgbuild for an acpi module (phc) that can change voltages is here: http://aur.archlinux.org/packages.php?ID=17884. So build and load the acpi-cpufreq-phc module (whatever it ends up being called), then change the voltages like method 0 in the thinkwiki article.

Btw if after building the package and install it with pacman does it instantly autowork or i still need to patch the linux kernel before install the package.kinda clueless how its work

i just download the Arch "Overload' so i guess the preinstall kernel would be 2.6.25.6

Last edited by burmmo (2008-06-28 14:41:45)

fwojciec

Member

Registered: 2007-05-20

Posts: 1,411

Re: Undervolting Laptop Pentium M 1.7ghz

I have a 1.7 pentium m (dothan) cpu in my laptop.  After installing acpi-cpufreq-phc I just added this to the /etc/rc.local script:

echo "31 22 16 10 5 2" > /sys/devices/system/cpu/cpu0/cpufreq/phc_vids

After rebooting the undervolting works and it actually does a very good job of keeping the cpu temperature down.  I've had no stability issues so far with these values, though you can experiment with different ones to see what works best on your system.

burmmo

Member

Registered: 2008-06-23

Posts: 12

Re: Undervolting Laptop Pentium M 1.7ghz

echo "31 22 16 10 5 2" > /sys/devices/system/cpu/cpu0/cpufreq/phc_vids

.

Hooryay the undervolt function work for me:lol: i will using the code above cos my processor also a Pentium m 735 Dothan but with 400fsb bus.

Last edited by burmmo (2008-07-01 21:10:01)