Data Sheet

Datasheet, Volume 1 of 2 83
Power Management
4.5 Direct Media Interface (DMI) Power Management
Active power management support using L1 state.
Note: The PCI Express* and DMI interfaces are present only in 2-Chip platform processors.
4.6 Processor Graphics Power Management
4.6.1 Memory Power Savings Technologies
4.6.1.1 Intel
®
Rapid Memory Power Management (Intel
®
RMPM)
Intel
®
Rapid Memory Power Management (Intel
®
RMPM) conditionally places memory
into self-refresh when the processor is in package C3 or deeper power state to allow
the system to remain in the deeper power states longer for memory not reserved for
graphics memory. Intel RMPM functionality depends on graphics/display state (relevant
only when processor graphics is being used), as well as memory traffic patterns
generated by other connected I/O devices.
4.6.1.2 Intel
®
Smart 2D Display Technology (Intel
®
S2DDT)
Intel
®
S2DDT reduces display refresh memory traffic by reducing memory reads
required for display refresh. Power consumption is reduced by less accesses to the IMC.
Intel
®
S2DDT is only enabled in single pipe mode.
Intel
®
S2DDT is most effective with:
Display images well suited to compression, such as text windows, slide shows, and
so on. Poor examples are 3D games.
Static screens such as screens with significant portions of the background showing
2D applications, processor benchmarks, and so on, or conditions when the
processor is idle. Poor examples are full-screen 3D games and benchmarks that flip
the display image at or near display refresh rates.
4.6.2 Display Power Savings Technologies
4.6.2.1 Intel
®
(Seamless and Static) Display Refresh Rate Switching
(DRRS) with eDP* Port
Intel
®
DRRS provides a mechanism where the monitor is placed in a slower refresh rate
(the rate at which the display is updated). The system is smart enough to know that
the user is not displaying either 3D or media like a movie where specific refresh rates
are required. The technology is very useful in an environment such as a plane where
the user is in battery mode doing E-mail, or other standard office applications. It is also
useful where the user may be viewing web pages or social media sites while in battery
mode.
4.6.2.2 Intel
®
Automatic Display Brightness
Intel
®
Automatic Display Brightness feature dynamically adjusts the backlight
brightness based upon the current ambient light environment. This feature requires an
additional sensor to be on the panel front. The sensor receives the changing ambient
light conditions and sends the interrupts to the Intel Graphics driver. As per the change