Issue #642 has been updated by Patrick Rudolph.

Related links updated

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Bug #642: x201t Turbo boost not working, CPU running hot
https://ticket.coreboot.org/issues/642#change-2270

* Author: Janez Novak
* Status: New
* Priority: Normal
* Category: chipset configuration
* Target version: main
* Start date: 2026-05-03
* Affected versions: main
* Related links: Are C-states properly working? If not that would explain high 
temperature and non working turbo mode.

Can you please share full coreboot + kernel log?
What does `powertop` say? Does the CPU enter C1-C7 states?

Looking at the code I don't see configure_c_states() in the CPU driver, which 
might cause C-states to be disabled.
* Affected hardware: Lenovo X201 Tablet
* Affected OS: All
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Hello, i installed Coreboot on my x201t but turbo boost isn’t working and cpu 
won’t go past 2.1 GHz. My processor is an i7 640LM. Something i also noticed is 
that the system runs hotter with coreboot than with stock bios but i don’t know 
what’s causing that.



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