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Erratic Trackpad when USB Mouse Connected

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Dec 31, 2016
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Motherboard
HP Elitebook 8470p-Clover
CPU
i5-3320M
Graphics
HD 4000, 1366x768
Mobile Phone
  1. iOS
I successfully installed macOS Catalina on another volume on my EliteBook 8470p alongside my existing Mojave installation. So far, after a few tweaks to the kexts installed by the Clover Hotpatch Guide for ProBooks and EliteBooks by RehabMan (updated Lilu, AirportBrcmFixup, Bluetooth kexts etc. to latest versions), my installation works very well. Everything, including Wi-Fi, Graphics and Bluetooth (which gave me a lot of trouble) are now working.

However my only issue at the current moment is an erratic trackpad when my USB mouse is connected. The trackpad is fine when the device is not connected, but becomes erratic as soon as it is plugged in, and fixes itself when the device is unplugged. Is anyone else having this issue on their Catalina Hackbook, and has anyone found any solutions? I have included some problem reporting files.
 

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