X240s Display Flashes

There is a new problem on display.
When something changes on the display, especially for high brightness difference object.
(e.g. changing working window, changing editing photo, playing movie etc. )
Sometimes it may flashes like auto adjusting brightness level, for a few second.
The problem will cause in any condition and not cause in any condition.
I am concerned that shall be either power management driver didn't work or BIOS BUG.
Setting:
Windows 8.1
Drivers and Lenovo Softwares up to 30/OCT/2013
"Enable adaptive brightness" on battery / Plugged in = Off

If you have not done so, run the OS X Mountain Lion: Apple Hardware Test

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