What the it does is help manage the IOMobileFrameBuffer (sending pixels to the screen) and since that’s internal to the OS and a shared system on multiple operating systems - parts of the code aren’t relevant on different systems (intel vs Apple silicon and macOS vs iOS vs iPadOS), there’s not been any public documentation this part of the code afaik.
That subsystem became famous when people figured out how to run unentitled app code on iOS that escaped the security expected by sandboxing + entitlements for a third party app and let unexpected code run at the kernel level. (Causing crashes or worse - privacy and/or security breaches)
What specifically did the error say? Sometimes errors are harmless or even expected behavior.