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It looks like the touchpad on the Dell Latitude 5580 isn't supported. Funny enough, the touchpad on the 5570 is. I guess Dell must have switched touchpads in the 5580 from the 5570.
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Created attachment 193397 [details]
I have two of these laptops which will be used for interns. I can have them use a USB mouse for now, but it'd be nice to have support for the touchpad.
can you grab pci / usb from 5570 also and compare?
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dmesg.boot on the 5570
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pciconf -lv on the 5570
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usbconfig on the 5570
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.