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Old 10-31-2018, 11:17 AM   #9
AlbanRampon
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Join Date: Sep 2015
Location: Cambridge, UK
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Hello Wemo,

The option seen in these add-on applications, or more recently in Windows 10 allowing you to select your GPU can be misleading.
In a very simplified view, there are two different aspects in play here for you. The compute and the display. We could also simplify this by saying that the device creating the graphics is not necessarily the one used to display them: you need to compose the desktop from the surfaces from the different applications, not all of them necessarily calculated on the same GPU.
Some applications don't offer you the high end graphics because the application doesn't list adapters without display attached to it.

Currently in progress is trying to address both a bug in the display enumeration mechanism and allow our driver to select GPU affinity.
That's in progress today and started roughly early October.

The display enumeration mechanism bug means that if you have an indirect display (Miracast, DisplayLink...) as primary/main display, then the capability of the GPU are wrongly reported. An indirect display is a display not directly/physically connected to the GPU.
For that, the workaround to get the capability is to mark a direct display (like the laptop native screen) as primary.
Would you please be able to check which display is your primary display? Having the basic capability wrong affects performance as you lose hardware acceleration and sometimes lose access to an app which could refuse to load if it doesn't see OpenGL 3+, for instance.

All that applies to all versions since Anniversary (Redstone 1 to Redstone 4). With the latest combination of OS (RS5) and Intel graphics drivers, I don't have the "primary" display problem. I can't select the GPU (and I only have one) yet, that's next version of Windows 10. As this will need a change of the Windows API, we will need a new DisplayLink driver to leverage that new feature, and it's obviously planned to start as soon as we get the OS graphics development builds.

It's too late for the wand. Help would have been useful to get the work started earlier by using the Windows 10 Feedback Hub, the official feedback gathering mechanism Microsoft told us to use to get it prioritised.
Now the work has started.

Kind regards,
Alban
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Alban Rampon
Senior product manager, universal docking stations and accessories
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