Looking at kernel 4.14, I see a config:

  CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS

We have this at 0 right now.  I think it's supposed to be something larger.  Specifically it looks like things happen like this when we see a critical thermal event:

* Schedule an emergency power off for CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS later.
* Start an orderly shutdown.

I'm looking specifically at handle_critical_trips().


...so if CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS it seems like we'll start both the orderly and emergency shutdown at the same time.  That doesn't seem quite right.