Toshiba Satellite P845 - Manual (Page 37)

On Optimus models, two kinds of Display Drivers are installed: “Intel® HD
Graphics Driver” and “NVIDIA Graphics Driver XXX.XX”.
Do not uninstall the display driver from “Uninstall Program” in the Control
Panel.
If you have to uninstall the display driver, please follow the steps below:
1. Uninstall “NVIDIA Graphics Driver XXX.XX”.
2. Then uninstall “Intel® HD Graphics Driver”.
Intel ® Display Power Saving Technology
Intel GPU model may include the Display Power Saving Technology
feature that can save the computer's power consumption by optimizing
picture contrast on the internal LCD.
This feature can be used if the computer is:
running under battery mode
using the internal LCD display only
The Display Power Saving Technology feature is enabled at factory default.
If you want to disable the feature, you can disable it.
The Display Power Saving Technology feature can be disabled in the Intel ®
Graphics and Media Control Panel.
You can access this control panel in one of the following ways:
Click Start -> Control Panel. Select Large icons or Small icons in
View by, and then click Intel(R) Graphics and Media.
Right-click on the desktop and click Graphics Properties....
In this control panel:
1.
Click Power.
2. Select On battery from the drop-down menu in Power Source.
3. Clear the Display Power Saving Technology check box.
4. Click OK.
If you want to enable this feature, under the conditions mentioned above,
select the Display Power Saving Technology check box.
User's Manual 2-12