Photoshop: Not Recognizing External Graphics Card When Sidecar Is Enabled (macOS)

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  • Updated 3 months ago
  • (Edited)
I noticed odd behavior in PS (mouse toggles "sticking", particularly the New Layer and Add Layer Mask buttons; screen not redrawing properly) and in my attempt to troubleshoot, I've caught a bug that may or may not be related.  Specifically, when Sidecar is enabled and my iPad Pro is setup as a separate display, Photoshop is not recognizing the external graphics card, instead defaulting to my MBP's (gasp) integrated graphics.  When I disconnect Sidecar and relaunch Photoshop, the external card shows up in the Performance tab, as expected. 

The configuration is as follows:

16" Macbook Pro
2.4 GHz 8-Core Intel Core i9
64 GB Memory
AMD Radeon Pro 5500M (Internal)
Radeon RX Vega 64 8 GB (eGPU)
Wacom Cintiq Pro 24" (connected via eGPU)

MacOS 10.15.4 (19E266)
PS 21.1.1

The eGPU enclosure is a Mantiz Venus, which also functions as a TB3 dock. Part of the issue may stem from the fact that, owing to power requirements, the iPad has to be connected directly to the MPB, rather than those on the external housing.  (It works via the housing; it just doesn't receive power.). I've previously had a standard external display connected via the external card and I don't recall this ever being a problem, so I can only assume it has something to do with Apple's Sidecar implementation.  
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TJ Searl

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Posted 3 months ago

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