User's Manual

The Wireless Dock and Multiple Displays
Intel
®
Wireless Gigabit v2.0
October 2015 User Guide
Document Number: 537178-3.3 Intel Confidential 47
5 The Wireless Dock and Multiple
Displays
5.1 Intel
®
WiGig A/V wireless capabilities
Intel
®
WiGig is seen by the Intel
®
Display Driver as a DP V1.2 Branch device. It advertises its
capabilities to the driver using standard DisplayPort V1.2a tools.
The capabilities include A/V bandwidth, as well as other capabilities related to the internal A/V
subsystem.
Intel
®
WiGig HW can support up to two A/V streams. This limitation is advertised to the Intel
DisplayPort Driver, which then limits the number of active streams sent over the Intel
®
WiGig DP
interface.
When the user connects three displays to the MST hub at the output of the Intel
®
WiGig-based dock,
only two out of the three displays connected can be active at the same time.
5.1.1 Intel
®
WiGig DisplayPort Bandwidth and other limitations
The DisplayPort V1.2a standard defines mechanisms that allow branch devices to advertise their
capabilities and limitations to the Display Driver. There are two main limitations which may affect the
user experience:
1. DisplayPort Bandwidth (AKA PBN): Intel
®
WiGig DP interface operates at 4  2.7 gbps
speed. This results in an ability to support single display resolutions of up to 2560x1600@60 Hz
or Dual Display Resolutions of 19201200@60 Hz.
For example, if the user connects 2 1600p60 capable displays to the dock, it cannot drive the
native resolution to both displays due to the DP BW limitation. The Display Driver will remove
some of the video modes from one of the displays while allowing native resolution to the 2
nd
display.
2. Wireless Branch Device Limitations (AKA CCS): Intel
®
WiGig DP interface advertises
Wireless Branch Device limitations related to the capabilities of the integrated video Encoders
and Decoders.
Currently the advertised limitations are:
a. Frame Width <= 2560
b. Frame Height <= 1600
c. Max Frame Rate = 60 Hz
d. Min Frame Rate = 59 Hz
e. Max Pixel Clock = 268 MHz
f. RGB: Only color space modes supported
g. Progressive only modes supported
All display modes not meeting the criteria above will be removed by the display driver and
not shown by the Resolution Manager.