Battery problem (CPU a bottleneck) with BIOS and Intel SpeedStep technology.

The question is this:

1. If the AC adapter and the battery are both connected on the X201T, the speed of the CPU (base clock) is capable of running at the maximum speed of 2.13 GHz as indicated by the specifications of the system.
2. If only the battery is connected, the speed of the CPU is still able to run at maximum speed of 2.13 GHz as indicated by the specifications of the system.
3. If only the AC adapter is plugged in, the speed of the CPU is now 'limited' and can run only at 1.2 GHz.
4 in addition, I also ran Windows Experience Index assessment (built-in to Windows 7) and received a score of 6.3 with the battery or the AC adapter is plugged in, but only a score of 4.2 with only the AC adapter.
5. the system is significantly slower and cursor shifts are more noticeable when the battery is disconnected.

Control Panel:
A.the system has been set at maximum Performance with all the power saving settings turned off. The system has been fully updated for the latest updates and possible drivers from 12/03/10 at the time of the breathalyzer test.  No other software is installed that came with the ThinkPad when I received it.
B. with the connection and disconnection of the battery, the system has been individually disabled every time and restarted.
C. I ran full system Test and system through Lenovo ThinkVantage Toolbox stress Test and received no errors to ensure that the question was not due to system errors.
D. I used CPU - Z 1.56 v to monitor the speed of the CPU, all running Intel BurnTest v2.50 to insist on the system.
E. the problem is reproducible and probably a system wide problem/bug, because I tested it on two my X201T (I know it's weird, but I have two of these amazing machines).


After further testing, I've isolated the problem of "Bottleneck the CPU processor without battery" occurs only when the technology Intel SpeedStep in BIOS is enabled. Only when the SpeedStep technology option is cleared "completely", this problem will not occur. However, if the SpeedStep technology is enabled, even when the AC is set on maximum Performance, the CPU processor speed is limited when the battery is disconnected with the tablet running only on the AC adapter. This seems to be a bug in the BIOS.

If someone can communicate this problem Lenovo Engineering Department so that they can arrive at a solution, that would be great and very helpful. So I can work on my system without always having the battery plugged.

There are 2 solutions for that.

You spend more money for a 90W power adapter (which I did), then you can disconnect the battery and it will run at full speed.

Or, you go into the BIOS and turn off IntelSpeedStep.

Unfortunately, without the battery, when only using the 65W adapter, your speed will be throttled (I think it's a mistake on the end of Lenovo, but they claim it's normal).

Tags: ThinkPad Notebooks

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