Data Sheet

Power Management
84 Datasheet, Volume 1 of 2
in Lux, (current ambient light illuminance), the new backlight setting can be adjusted
through BLC. The converse applies for a brightly lit environment. Intel Automatic
Display Brightness increases the backlight setting.
4.6.2.3 Smooth Brightness
The Smooth Brightness feature is the ability to make fine grained changes to the screen
brightness. All Windows* 10 system that support brightness control are required to
support Smooth Brightness control and it should be supporting 101 levels of brightness
control. Apart from the Graphics driver changes, there may be few System BIOS
changes required to make this feature functional.
4.6.2.4 Intel
®
Display Power Saving Technology (Intel
®
DPST) 6.0
The Intel DPST technique achieves backlight power savings while maintaining a good
visual experience. This is accomplished by adaptively enhancing the displayed image
while decreasing the backlight brightness simultaneously. The goal of this technique is
to provide equivalent end-user-perceived image quality at a decreased backlight power
level.
1. The original (input) image produced by the operating system or application is
analyzed by the Intel DPST subsystem. An interrupt to Intel DPST software is
generated whenever a meaningful change in the image attributes is detected. (A
meaningful change is when the Intel DPST software algorithm determines that
enough brightness, contrast, or color change has occurred to the displaying images
that the image enhancement and backlight control needs to be altered).
2. Intel DPST subsystem applies an image-specific enhancement to increase image
contrast, brightness, and other attributes.
3. A corresponding decrease to the backlight brightness is applied simultaneously to
produce an image with similar user-perceived quality (such as brightness) as the
original image.
Intel
®
DPST 6.0 has improved the software algorithms and has minor hardware
changes to better handle backlight phase-in and ensures the documented and validated
method to interrupt hardware phase-in.
4.6.2.5 Panel Self-Refresh 2 (PSR 2)
Panel Self-Refresh feature allows the Processor Graphics core to enter low-power state
when the frame buffer content is not changing constantly. This feature is available on
panels capable of supporting Panel Self-Refresh. Apart from being able to support, the
eDP* panel should be eDP 1.4 compliant. PSR 2 adds partial frame updates and
requires an eDP 1.4 compliant panel.
PSR2 is limited to 3200x2000@60 Maximum display resolution.
4.6.2.6 Low-Power Single Pipe (LPSP)
Low-power single pipe is a power conservation feature that helps save power by
keeping the inactive pipes powered OFF. This feature is enabled only in a single display
configuration without any scaling functionalities. This feature is supported from 4th
Generation Intel
®
Core™ processor family onwards. LPSP is achieved by keeping a
single pipe enabled during eDP* only with minimal display pipeline support. This
feature is panel independent and works with any eDP panel (port A) in single display
mode.