Comment # 2 on bug 1226065 from David Walker

(In reply to Takashi Iwai from comment #1)
> Are you using vmware stuff?

No VMware or any other virtualization. Your comment, though, lends credence to
my more recent suspicions that my diagnosis was wrong.

What I have noticed over the past few days is that I still have the problem at
times. I was busy, so I switched to hibernate, instead of suspend, in
/etc/systemd/logind.conf.d:

  [Login]
  HandleLidSwitch=hibernate
  HandleLidSwitchExternalPower=hibernate

That resolved the issue, but I'd rather be using suspend.

I'm now thinking that the "i8042.reset i8042.nomux=1" that I added to the
kernel command line (when the laptop was new and had this problem) no longer
has the desired effect. Does that make any sense? Would there be another
workaround if so?