I have a 2019 MacBook Pro with Radeon Pro 560X 4 GB (and Intel UHD Graphics 630 1536 MB)
Yesterday, Lightroom was showing "Auto" under the performance tab for 'Use graphics processor'.
Today, it is disabled (now connected to my LG 5K display).
I have disabled auto graphics switching in macOS.
I have removed Lightroom and its preferences. Reinstalled. No change.
Adobe support says that my graphics card is 'disabled' and to contact Apple.
When viewing the 'system info' from Lightroom, the graphics card shows as Unknown.
Can anyone help?
Lightroom version: 3.2 [ 20200204-0604-bc5e360 ] (Feb 4 2020)
NGL Version: 188.8.131.52
Operating system: macOS
OS Version: 10.15 
Application architecture: x64
Computer model: MacBookPro15,1 / Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
Logical processor count: 12
Processor speed: 2.9 GHz
Built-in memory: 32,768.0 MB
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 2,095.8 MB (6.3%)
Virtual memory used by Lightroom: 4,638.5 MB
Memory cache size: 731.7 MB
Internal Camera Raw version: 12.2 [ 385 ]
Maximum thread count used by Camera Raw: 7
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 14MB / 16383MB (0%)
Camera Raw real memory: 14MB / 32768MB (0%)
Displays: 1) 3360x2100, 2) 5120x2880
Graphics Processor Info: Unknown
Graphics Processor Detail: loaded: No, supported: No, compute: No, init: I1_Failed, hard: fail_no_gpu2, soft: not_checked, wl: No, bl: No
OS Media Capability: true
Application Folder: /Applications/Adobe Lightroom CC
Settings Folder: /Users/craigmdennis/Library/Application Support/adobe/Lightroom CC
Library Folder: /Users/craigmdennis/Pictures/Lightroom Library.lrlibrary