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What's DOS?
Posts: 1
Registered: ‎08-18-2013
Location: Israel
Views: 340
Message 1 of 1

X220: BIOS update v1.39.1.24 throttles CPU with AC connected

Hi everyone,


Yesterday I've installed the latest BIOS Update (v1.39.1.24) via the System Update and since then my CPU is clocked at 800MHz top while on AC. The problem persists across OSes (Windows/Linux) which indicates the culprit is the BIOS update.

I've tried downgrading to which flashed O.K. but the problem remains. Tried re-updating the BIOS via the bootable CD option (with v1.39 from Lenovo's site) but the problem remains.

Knowledge base says any BIOS post 1.21 is O.K. so that's not very helpful.


I'd appreciate some help,




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