By the way, these are the types I get:
/sys/class/thermal/thermal_zone0/type:acpitz
/sys/class/thermal/thermal_zone1/type:SEN2
/sys/class/thermal/thermal_zone2/type:SEN3
/sys/class/thermal/thermal_zone3/type:SEN4
/sys/class/thermal/thermal_zone4/type:B0D4
/sys/class/thermal/thermal_zone5/type:iwlwifi_1
/sys/class/thermal/thermal_zone6/type:x86_pkg_temp

thermal_zone3, which causes most shutdowns, is actually not a CPU core -
it's value doesn't match any of the values shown by the sensors command.

What could be the mysterious SEN4? How can I trace it further?

Moreover, the thermal shutdown is more easily reproduced when laptop is
charging (battery below 100%) on AC power.

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https://bugs.launchpad.net/bugs/1873083

Title:
  Lenovo Yoga C940 frequently does thermal shutdown

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