Issue #642 has been updated by Patrick Rudolph.
I'm not sure what else is missing. On newer platforms BIOS_RESET_CPL needs to be written before CPU frequency can be changed and turbo is working. I don't see that on Nehalem. In general the code base is less maintained than newer platforms are. It could be difficult to figure out what's missing. You could do from Linux. Boot in vendor UEFI/BIOS and then flash coreboot and: - Dump all MSRs - Dump MCHBAR and PCI registers of 0:0.0 (using inteltool) and compare it for differences. Then try to write the same register values in coreboot until turbo works. ---------------------------------------- Bug #642: x201t Turbo boost not working, CPU running hot https://ticket.coreboot.org/issues/642#change-2281 * Author: Janez Novak * Status: New * Priority: Normal * Category: chipset configuration * Target version: main * Start date: 2026-05-03 * Affected versions: main * Affected hardware: Lenovo X201 Tablet * Affected OS: All ---------------------------------------- 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. ---Files-------------------------------- Kernel Logs.md (80.4 KB) Coreboot Logs.md (152 KB) Powertop Screenshot.png (34.5 KB) .config (22.3 KB) Coreboot Logs New.md (87.9 KB) Kernel Logs New.md (79.4 KB) Kernel Logs Stock BIOS.md (91.9 KB) -- You have received this notification because you have either subscribed to it, or are involved in it. To change your notification preferences, please click here: https://ticket.coreboot.org/my/account _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
