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Error trying to unloaded kext for track pd
MacBook-Pro:~ ian$ sudo kextunload /System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTrackpad.kext
(kernel) Can't unload kext com.apple.driver.AppleUSBTrackpad; classes have instances:
(kernel) Kext com.apple.driver.AppleUSBTrackpad class AppleUSBFnTrackpad has 1 instance.
(kernel) Kext com.apple.driver.AppleUSBTrackpad class AppleUSBGrIITrackpad has 1 instance.
(kernel) Kext com.apple.driver.AppleUSBTrackpad class AppleUSBGrIIITrackpad has 1 instance.
(kernel) Kext com.apple.driver.AppleUSBTrackpad class AppleUSBTrackpad has 1 instance.
Failed to unload com.apple.driver.AppleUSBTrackpad - (libkern/kext) kext is in use or retained (cannot unload).
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