System Information
Operating system: Darwin-19.0.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel(R) UHD Graphics 630 Intel Inc. 4.1 INTEL-14.2.17

Blender Version
Broken: version: 2.81 and 2.82 (sub 3), branch: master, commit date: 2019-12-03 17:56, hash: rBfda791ab1241

Short description of error
Blender does not use the discrete GPU when automatic graphics switching is enabled in macOS, even though it is supposed to support this and the viewport and Eevee renders are much faster when the GPU is enabled.

Exact steps for others to reproduce the error
In system preferences -> energy saver, when automatic graphics switching is enabled, the GPU should be automatically enabled when necessary. However when running Blender this never happens, the integrated intel graphics card is used exclusively. When this setting is off, the discrete graphics card is used and the viewport and Eevee renderings are much smoother and faster (but keeping this setting off decreases battery life by a significant amount).

This is on the 2019 MacBook Pro 16" with intel UHD graphics 630 and AMD Radeon Pro 5500M.