Loss of trackpad functionality on portables with third-party drivers

We previously reported on an issue where the keyboard and trackpad suddenly become unresponsive on various Apple portables (MacBook Pros, MacBooks and PowerBooks included) forcing the user to reboot (after first shutting down by holding the power key) in order to regain control. We also noted number of potential fixes, including removal of keyboard shortcuts, checking for problematic remnants from system migrations and more.

Our most recent coverage noted that uninstalling third-party trackpad drivers (like RagingMenace's SideTrack) if present, can resolve the issue.

We've now received reports indicating a similar issue with third-party drivers for external input devices, like Kensington trackballs.

MacFixIt reader P.K. Worley writes:

"I have a new MacBook, 2 GHz, 1 GB SDRAM. When I'm home I thought it would be nice to use my Kensington Expert Trackball. I downloaded and installed Kensington's latest driver, configured the trackball... and it worked perfectly - until I unplugged its USB cable.

"At that point, I lost use of the track pad. I had a curser that would not move. I re-plugged the trackball and uninstalled the Kensington driver, rebooted, and got my track pad and curser back.

"Any thoughts on how I can keep the Kensington driver installed and still have use of the track pad? (with the track ball's USB cable NOT plugged into the Mac)."

As noted by P.K, uninstalling the trackball driver re-allowed normal operation of the built-in trackpad. However, are still seeking a solution that will allow the built-in trackpad to operate while the driver is present.

Feedback? Late-breakers@macfixit.com.

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