The above method however is not permanent and Intel Graphic and Media Control Panel will eventually automatically change 60Hz refresh rate back to 40Hz. At some forum, someone explained that this is method of slowing down the refresh rate to 40Hz is to reduce the power usage, therefore prolong the battery life. However I don't find it much different with the battery life with both setting. The biggest different with battery life is turning on the WiFi.
So what can I do to disable the Intel Graphic and Media Control Panel that automatically reduced refresh rate to 40Hz?
So here is the method:
- Open Registry Editor by typing "regedit" with the double quote in the "Search Program and Files" box after click the Windows button. Click Yes if UAC ask the usual question.
- Go to this registry key:
Warning: editing registry can be harmful to Windows OS. Please be extra careful, and backup the Windows via Windows Restore or other backup system you use. I am not responsible if your Windows behave strangely or crash due to this registry hacking.
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source: this tutorial I learned from http://forum.tabletpcreview.com/hp-elitebooks/46411-disable-intels-automatic-60hz-40hz-refresh-rate-change-batt.html