How to Turn Integrated Graphics On or Off in the BIOS and Turn nVidia Optimus Mode On or Off

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What Is nVidia Optimus?

Optimus can work on its own without user intervention. Whenever the computer runs apps that need heavy graphics processing, such as 3D games or HD flash video, the dedicated graphics card is activated, while light work such as typing documents uses the integrated graphics chip.
Optimus uses standard instruction sets and drivers supported by most manufacturers, rather than separate drivers like some competing technologies. Bug fixes, updates…. all come from a single source: nVidia, which is very convenient and fast.
What Is nVidia Switchable Graphics?
This is a technology nVidia has been developing since around 2007. It allows switching between the integrated graphics chip and the dedicated graphics card. However, this technology is not yet mature and still has many weaknesses that frustrate users. Namely, they have to switch between the 2 graphics modes manually, and every time they switch, the computer has to restart or log off. Even when no restart is needed, switching between these 2 modes still takes 5-10 seconds.
Moreover, the computer screen flickers while switching, which is annoying for users. Some apps also have to be closed before users can switch graphics cards. Even manufacturers have to spend extra on additional circuit boards, display interfaces….. and as a result, the product price goes up.

How to Turn Integrated Graphics On or Off in the BIOS and Turn nVidia Optimus Mode On or Off

Here I am doing it on a Dell Precision M4800,
Step 1: First, turn on the computer and immediately press F12 or F2 to enter the BIOS,
You can see how to enter the BIOS on other computers here

After entering the BIOS, go down to Video > Switchable Graphics and uncheck Enable Switchable Graphics. Then click Apply to save and restart the computer

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