Debugging an unresponsive touchpad on Lenovo Ideapad 320-15ABR

I have a Lenovo Ideapad 320-15ABR, (I found the exact model name with dmidecode). I'm having trouble getting the touchpad to work. It's not showing up in xinput --list or cat /proc/bus/input/devices. I'm using Linux 4.13.2, compiled with some extra debugging messages. Here's some relevant dmesg output when booted with i8042.nopnp. Without this option, I get the message: i8042: PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp $ dmesg|grep psm [ 2.595815] bus: 'serio': add driver psmouse [ 2.627475] bus: 'serio': driver_probe_device: matched device serio1 with driver psmouse [ 2.627477] bus: 'serio': really_probe: probing driver psmouse with device serio1 [ 2.627482] psmouse serio1: no default pinctrl state [ 2.651584] psmouse: probe of serio1 rejects match -19 $ dmesg|grep i8042 [ 2.577522] i8042: PNP detection disabled [ 2.578648] Registering platform device 'i8042'. Parent at platform [ 2.578650] device: 'i8042': device_add [ 2.578655] bus: 'platform': add device i8042 [ 2.578668] PM: Adding info for platform:i8042 [ 2.578682] bus: 'platform': add driver i8042 [ 2.578692] bus: 'platform': driver_probe_device: matched device i8042 with driver i8042 [ 2.578694] bus: 'platform': really_probe: probing driver i8042 with device i8042 [ 2.578699] i8042 i8042: no default pinctrl state [ 2.578702] devices_kset: Moving i8042 to end of list [ 2.595059] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 2.595070] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 2.595125] driver: 'i8042': driver_bound: bound to device 'i8042' [ 2.595150] bus: 'platform': really_probe: bound device i8042 to driver i8042 [ 2.604184] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input0 **edit:** I've opened a ticket here in case anyone is interested in following this problem: https://bugzilla.kernel.org/show_bug.cgi?id=196985