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Intel-undervolt: CPU undervolting and throttling configuration tool for Linux

(github.com)
132 points cl3misch | 3 comments | 17 Jun 24 22:44 UTC | HN request time: 0s | source
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chx ◴[18 Jun 24 01:44 UTC] No.40713262[source]▶
> my i7-8650U

those can but 10nm CPUs after Plundervolt can't undervolt , it's disabled from UEFI and not only there's no option to reenable it in the UI, the very EFI variable itself is write locked. I have an X1 Gen 4 (Intel 11th gen) and you just can't do it.

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lm411 ◴[18 Jun 24 02:44 UTC] No.40713587[source]▶
Damn, you mean we can't just swap resistors to under/over volt anymore?

I am getting old.

(tongue in cheek, and yes, I am getting old)

Shit, I remember just using a pencil to lower resistance values.

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1. ngneer ◴[18 Jun 24 03:03 UTC] No.40713686[source]▶
You can. The main thing is that software-based attacks are easier to perform.
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2. chx ◴[18 Jun 24 03:14 UTC] No.40713750[source]▶
That'd be reason to take away the reenable from UEFI but write protecting the EFI variable where changing it already requires to boot into an EFI editor is just being dicks, pardon my French. Just let me enable it , I am aware of the risks.
replies(1): >>40725858 #
3. ngneer ◴[19 Jun 24 07:41 UTC] No.40725858[source]▶
I think the trouble is that it is not possible to distinguish (through reliable technical means) a responsible overclocker such as yourself versus an unscrupulous actor editing EFI variables in flash. So, because some bad guys/gals found a way to damage the system, all the good guys/gals suffer as a result, because the system cannot tell them apart. Reminds me of airport security...