Undervolt x201 possible?

X200, X201, X220 (including equivalent tablet models) and X300, X301 series specific matters only.
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megasamu
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Undervolt x201 possible?

#1 Post by megasamu » Thu Mar 10, 2016 9:28 am

Hello, did it want to ask you, if there is some possibility of lowering the voltage x201? Since I have not found anything. To have if there is some way for mod bios or by means of software. Thank you in advance. :thumbs-UP:

Dekks
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Re: Undervolt x201 possible?

#2 Post by Dekks » Fri Mar 11, 2016 8:30 am

Not that i've seen reading up on the special kernel modules needed, seems Intel stopped it with the mid age C2D's.
Arch//Openbox R61//GNOME 3 X201i/X230 Tablet //Spectrwm T61/X61/X61 Debian 9/X32
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axur-delmeria
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Re: Undervolt x201 possible?

#3 Post by axur-delmeria » Fri Mar 11, 2016 2:13 pm

IIRC, Intel locked down the voltage control for mobile processors after the Core 2 generation.

Linux-PHC (the out-of-tree kernel module that handles undervolting) notes that it works on Core i series up to the 2nd generation (Sandy Bridge), but there's no mention of mobile CPU support (the i3-500 series was mentioned as tested, but that's a desktop CPU).
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

megasamu
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Re: Undervolt x201 possible?

#4 Post by megasamu » Sat Mar 12, 2016 6:16 am

Dekks wrote:Not that i've seen reading up on the special kernel modules needed, seems Intel stopped it with the mid age C2D's.
axur-delmeria wrote:IIRC, Intel locked down the voltage control for mobile processors after the Core 2 generation.

Linux-PHC (the out-of-tree kernel module that handles undervolting) notes that it works on Core i series up to the 2nd generation (Sandy Bridge), but there's no mention of mobile CPU support (the i3-500 series was mentioned as tested, but that's a desktop CPU).
So that suffers, since the truth with fewer voltage serious the laptop perfect for my.
Sorry for my english.

SurrealMustard
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Power management

#5 Post by SurrealMustard » Sat Mar 12, 2016 12:08 pm

Doesn't the "Maximum processor state" under "processor power management" inside of the advanced options for your power plan control this?

axur-delmeria
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Re: Power management

#6 Post by axur-delmeria » Sat Mar 12, 2016 12:27 pm

SurrealMustard wrote:Doesn't the "Maximum processor state" under "processor power management" inside of the advanced options for your power plan control this?
This looks like a Windows feature. In any case, it only controls the processor's clock speed, and not the voltage IIRC.

In Windows you need specialized software like RMClock, Throttlestop, or IBM_ECW to play around with the CPU's core voltage, but as been mentioned already, voltage control is not accessible in mobile Core i series CPUs.
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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