For me the fix was to change the hub that my cable was plugged into. Every time I would try to sync my iPhone would disappear from showing up in Finder.
vjpr
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In this talk it is also mentioned that you can use Core Foundation in DriverKit...
By sampling WindowServer, I found that IOHIDPointerScrollFilter is being loaded from /System/Library/HIDPlugins/IOHIDPointerScrollFilter.plugin. I wonder if my plugin would load from here. I'm guessing its more difficult.
I ran into the same issue. I had copied code from IOUserHIDEventDriver.cpp which doesn't call RegisterService() - even though it says "An IOUserHIDEventDriver object is a fully functional driver..." on the docs page.
Adding the RegisterService call fixed my issue too. Better docs are needed.