[Bug 228251] Touchpad non-functional on Dell Latitude 5580

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228251

--- Comment #8 from Trenton Schulz <trueos at norwegianrockcat.com> ---
Having a Dell 5580, I took a deeper look at this. It seems the problem is more
that the touchpad on the 5580 is now using i2c.

One can get it to work on 12.1-RELEASE if one isn't scared of getting one's
hands dirty. You need to:

Modify the ig4 driver so that it gets interrupts:
See comment by wulf from July 27, 2019 on review D16698.

Use wulf7's iichid driver on github.

Rebuild Xserver with evdev support (bug #222609).

You may still need to tweak the configuration for the keyboard (see bug
#196678, comment 121).

I guess all of this stuff is slowly making progress to the next release and
ports.

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