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Eyefinity under bootcamp doesn't detect MBP retina display

Question asked by disasterman on Jan 14, 2020

Hardware: 15" MBP 2019 - Radeon Pro Vega 20

Software: Boot Camp Unified Driver R3 for Windows 10 (https://drivers.amd.com/drivers/unified_r3_19.30.01.33_whql_191121a-349047c.zip )

Displays: Built-in retina display, External displayport Packed Pixels (x2) on USB-C adapters

 

Problem:

 

Windows recognises all three displays.
AMD settings recognises all three displays
Eyefinity only recognises the external Packed Pixels displays. It can make a single spanned display out of these two, but the built-in retina display is still a separate desktop.

 

See attached image showing Windows display settings with all three displays, and Eyefinity only detecting two.

 

Just for reference: Custom Adrenaline 2020 drivers from bootcampdrivers.com are worse - it also only detects the external displays, but on the layout page it only has an option for 0x0 layout.
[EDIT] Some earlier versions of the bootcampdrivers.com installer have the same effect as the official AMD drivers.

Expected behaviour:

Eyefinity configurator should detect all three displays so a single desktop spanning all displays can be created.


Any advice gratefully received. Thank you for your time.


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