System Information
Operating system: macOS Catalina
Graphics card: 2.2 GHz Dual-Core Intel Core i7

Blender Version
Broken: v2.81.16

Short description of error
Viewport shading of eevee entirely unusable. It displays a usually green and purple pixelated display, similar to that of a broken display. It is rather cool looking and it would be interesting to see as an effect, but when you are trying to preview your volumetric lighting it can get extremely frustrating. objects are typically all black, with ghosting. If I move the viewport, the display will either be fixed, all black, or just not changed. This happens fairly often, although I am pretty sure only when using the principled volume shader. (connected to the correct node). I do not have a GPU, using the integrated one in the i7 cpu. Cycles is fine.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Add a volume shader, go into render preview. Occasionally happens, occasionally is fine.