Talk:Pentium M undervolting and underclocking

From ThinkWiki
Revision as of 04:18, 17 November 2007 by KotCzarny (Talk | contribs) (fid:vid for a processor family is similiar)
Jump to: navigation, search

Hei Thinker,

according to my notion of the character of this page, i thought it should possibly be renamed to something like "How to lower voltage and clock speed on Pentium M processors" ("lower" might be replaced by "finetune" or "manually lower" or "tweak" or something else expressing more the expert audience of the article). This has the following advantages:

  • complies with the naming scheme ;-)
  • has words more likely to be found in google (voltage vs. undervolting; clock, speed vs. underclocking)
  • Are undervolting/underclocking proper english words anyway?
  • Follows a scheme of "from general to specific". The topic of the article is underclocking/undervolting. That it's for Pentium M processors is kind of secondary to that.

What do you think? I can do it if you agree.

Wyrfel 00:21, 21 Oct 2005 (CEST)

Good points. Personally I'm fond of short technical titles, but I agree about accessibility and consistency with the rest of the site. I have a feeling (though no proof) that the underclocking doesn't really work (as I noted recently), so how about "Reducing voltage on the Pentium M processor" for now?

BTW, "underclocking" is pretty standard techie jargon (and a clear parallel of the well-known "overclocking"). "Undervolting" is somewhat less common, though I've seen it in use.

--Thinker 00:55, 21 Oct 2005 (CEST)

Which patch to use?

Since I might find the time to fiddle around with reducing the power consumption further, I wonder which of the 3 alternatives works best. Any recommendations?

--spiney 11:05, 21 Dec 2005 (CET)

They all work... I think Alternative 2 is easiest to use.

--Thinker 13:06, 21 Dec 2005 (CET)

Init Script

Hi. I'm the author of the SysFS patch of "Alternative 2"

I have recently seen that someone has added your init script to my wiki page on gentoo-wiki. But unfortunatly this guy has removed all the exisiting content of the page at the same time. So a few hours later an admin of the site as reverted the page to its previous state.

Well that was just for the story of how I came to your wiki page. I just wanted to say That I have adedd again the init script to my page. It's a nice thing. A lot more "gentoo spirit" that what I was using before (that is adding some code in /etc/conf.d/local.start)

I have made some modifications to the init script before adding it on my wiki page. So maybe you want to have a look at it.

Cheers! --Bdz 23:26, 10 Jan 2006 (CET)

Trouble loading modules

If you receive the error after applying the bdz patch: 

    FATAL: Error inserting speedstep_centrino
   (/lib/modules/2.6.15.4/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko): No such device

be sure you have included "ACPI tables" for decoding valid frequency - voltage pairs.

Also, note you may have to manually "modprobe" the speedstep-centrino during your boot sequence. For some reason it won't autodetect on my debian sid system.

Underclocking results in a *noticably* cooler processor, approximately 3-5 degrees, which is often enough to have the fan stop (now 43 deg basal temp on my lap.) The battery life boost is much more modest, I'm down to 17.5 W/h now with everything off.

--gsmenden 23:50, 12 Feb 2006 (EST)

Undevolting a Core Duo

I have a Core Duo T2500, according to https://www.dedigentoo.org/trac/linux-phc/wiki/IntelCoreLimitationsOfLinuxPHC0_2_X, undevolting does not work really good, but the info is quite old too. So I want to ask if somebody is running an undervolted Core-CPU and has success with longer battery life and lower fan usage?

--Zhenech 14:45, 14 February 2007 (CET)

VID-only tables are useless

Please don't publish only VID data. You also need to publish the FID, because not all BIOSes/OS combinations allow one to select every possible frequency step, and users will later need to find out which FID correspond to each VID...

--hmh 20:30, 7 September 2007 (UTC)

Observation: fid:vid for a processor family is similiar i have two machines with p-m dothan processor (x41t 1.5 ghz LV and x32 1.8ghz) and it seems that for any given frequency (FID), stable voltage (VID) is very similiar, if i get my hands on some banias based thinkpad, i will check if that theory extends there

--KotCzarny 03:16, 17 November 2007 (UTC)

Retrieved from "https://www.thinkwiki.org/w/index.php?title=Talk:Pentium_M_undervolting_and_underclocking&oldid=34642"