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X220 CPU throttles back to low clock rate while on AC with 65W adapter - prior to BIOS 1.21

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Started ‎09-21-2011 by
Modified ‎09-21-2011 by
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X220 CPU throttles back to low clock rate while on AC with 65W adapter - prior to BIOS 1.21

Symptoms

 X220 CPU clock rates may  throttling down to lowest state even when a max performance profile is used, even while plugged in when using the 65W adapter.  Unlike other power controls in Power Manager / BIOS, CPU Power Management (and Speedstep) can only be turned on/off globally, not separately by power source.

Diagnosis

X220 ThinkPads using the 65W adapter and BIOS versions prior to 1.21 could exhibit these symptoms.

No throttling was evident when using 90W AC adapters.

Solution

 

The cumulative fix to address the semi-perma throttling described above is contained in BIOS 1.21 and later - see links below.  This also includes the fixes for the perma-throttling symptoms previously resolved in version 1.19.

 

 

BIOS 1.21 for X220

 

BIOS Utility here

BIOS text here

 

BIOS ISO here

BIOS ISO text here

 

--------------------------------------------------------------------------------
CHANGES IN THIS RELEASE
  Version 1.21

[Important updates]
  Nothing.

[New functions or enhancements]
- Improved system performance when heavy program is executed with 65W AC adapter.
- Improved system boots time.
- Disabled keyboarding while the lid was closed to avoid unexpected key input
  when the computer was held with the lid closed.

[Problem fixes]
- Fixed an issue where the computer might not be booted from bootloader program.
- Fixed an issue where a 1820 error might occur at power-on when the external
  fingerprint reader device was attached to the computer while the integrated
  fingerprint reader was disabled in the ThinkPad Setup.
- Fixed an issue where the computer might fail to boot when connected the
  Smartphone with the USB port.
- Improved cooling fan noise.
- Corrected spelling mistakes in BIOS setup menu.


--------------------------------------------------------------------------------




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