I have this bug, at least partially. My keyboard keeps working, but
touchpad doesn't work after reboot. I originally commented in this
report:

https://bugs.launchpad.net/ubuntu/artful/+source/linux/+bug/1723799

but they asked to create a new report.

This is what I said there:

========================
I too am affected now. After suspend+resume, my touchpad isn't found. Rebooting 
doesn't help: I really have to turn the machine off and on again.

I can attach mouse, and then if I try to open touchpad settings in Input
Devices settings (I use Kubuntu), it says that Touchpad isn't found, and
xinput doesn't show it either.

- Fujitsu E556 laptop
- 4.15.0-20-generic #21-Ubuntu

I still have Ubuntu 16.04 on one SSD with the kernel 4.4.0-119-generic,
and the issue doesn't appear there. I think the issue didn't appear on
Kubuntu 17.04 either. I didn't try 17.10.

The workaround mentioned in the original post didn't work for me. When I ran
sudo modprobe i2c-hid, I got this message:

rmmod: ERROR: Module i2c_hid is not currently loaded

The command
sudo modprobe i2c-hid

completed, but the touchpad didn't start working.
======================

As was asked by jsalisphury, I tested this with the latest mainline
kernel (generic) too:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17/

The problem wasn't affected – the touchpad doesn't resume.

I hope this helps. I'm not sure if *I* should add the 'kernel-bug-
exists-upstream' tag though, because I'm not OP, and my problem is
slightly different.

I hope this helps

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https://bugs.launchpad.net/bugs/1769792

Title:
  Keyboard and Touchpad do not work after suspend/resume

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