Have you ever been upset with the rude action taken by the Intel integrated graphics card constantly switching the refresh rate of your screen to 50 Hz whenever you unplug your AC power adapter? Hate the annoying scan lines? Eyes got tired quickly? Whenever plugging in/pulling off the AC adapter, messed up your current player cuz you no longer see video output or the player simply crashed? Really tired of the screen flickering? Here is the fix for you! This way is essentially the same way as mentioned on the Lenovo site, however my method could avoid breaking the digital signature of the driver. Furthermore, not every version of the driver comes with the same key value so it's difficult for newbies to generalize. Now this guide is simple and easy. This guide has been tested and proved to be working in Windows 7 64-bit, with the following versions of graphics card driver: Intel 220.127.116.111 (downloaded from Intel's website) Lenovo 18.104.22.1688 (downloaded from Lenovo's website) Intel 22.214.171.1249 (downloaded from Intel's website) Disclaimer: This guide includes registry editing, and it is only recommended for experienced users. Unwanted changes to the registry may lead to unexpected problems, so move with caution and stop if you are not sure what you are doing! Open Start Menu, and type "regedit", right click on "regedit.exe" and select "Run as administrator". Locate the following path: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Press Ctrl + F, and search for the following key: FeatureTestControl If everything goes well, you should be able to locate a DWORD with hex value f900. Change it to f940. (Note: for later drivers, if you see f800, change it to f840.) Reboot your laptop. Now enjoy the consistency and sanity of a stable 60 Hz, regardless of power status!