Issue #637 has been reported by Patrick Rudolph.
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Bug #637: Sandybridge: C-States and Turbo not working in coreboot
https://ticket.coreboot.org/issues/637
* Author: Patrick Rudolph
* Status: New
* Priority: Normal
* Category: chipset configuration
* Target version: none
* Start date: 2026-04-06
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Observations showed that in coreboot:
- C-States are not working (asm("mwait"); has no effect)
- Turbo states (core above P0 frequency) aren't working
The P-state can be changed after BIOS_RESET_CPL, but it never goes into turbo
mode.
On Linux both are working fine.
It would be nice to have both fixed as turbo states could reduce boot time when
extracting the LZMA payload.
Tests show that around 20msec of boottime improvements are possible, just for
extracting the LZMA payload.
Tested version: 654f32847428f36c92c19932bdfec9f3510bf384
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