brent It's package name is 'xorg-driver-input-evdev' and is probably already installed, or keyboard and USB mouse wouldn't work.
I don't think that Solus installs xorg-driver-input-evdev as a default:
tomscharbach@dell-ts-7390-plasma ~ $ eopkg info xorg-driver-input-evdev
xorg-driver-input-evdev package is not installed
Package found in Solus repository:
Name: xorg-driver-input-evdev, version: 2.10.6, release: 30
Summary: Generic Linux input driver
Description: The Xorg Evdev Driver package contains Generic Linux input driver for the Xorg X server. It handles
keyboard, mouse, touchpads and wacom devices, though for touchpad and wacom advanced handling, additional drivers are required. .
Dependencies: glibc systemd libevdev mtdev
Distribution: Solus, Dist. Release: 1
Architecture: x86_64, Installed Size: 87.00 KB, Package Size: 29.00 KB
Reverse Dependencies: xorg-driver-input-evdev-devel xorg-driver-input-evdev-dbginfo
That is the report I get from both of my Solus builds. It might be that @mbevks can resolve his touchpad issue by installing the generic drivers, although is description describes an odd post-boot situation: "I still get the behavior, just with an invisible mouse. How do I make it visible?" I'm not sure what that means, exactly, but it sounds like the touchpad is functional after login, but the cursor does not display.
In any event, we need to hear from @mbevks before we can go much farther. Right now we are all speculating ahead of the facts.