My USB Function Driver Doesn't Load At Boot If Dongle Attached

[Mike Crawford]

This is new just today. It's been working well for a while now.

When functioning normally, the driver will match on the USB device's
product and vendor IDs, then will load and operate.

It's a USB video adapter so under normal operation, one sees a blurred
image of the desktop until login, then you get a second screen that
works correctly with Display Preferences.

But just today, if the dongle is attached at boot the driver doesn't
load and the USB-attached monitor doesn't show an image.

If I unplug the dongle then plug it back in, it works.

If the dongle is not attached during boot, then plugged in after
reaching the desktop, it works.

If the dongle is attached during boot, and I later use kextutil to
load it, kextutil reports success but it doesn't load.

I speculate it is a problem with matching but don't understand what
could have gone wrong.

It's a singed driver that's now in /Library/Extensions. There are two
other drivers in the product that don't match on USB. They load just
fine.

Mike Crawford mdcra...@gmail.com

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