I tested this on Lenovo X230 (CPU: Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz) and Asrock B85M Pro4 (CPU: Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz): both locked up inside `src/cpu/x86/smm/smi_trigger.c` function `apm_control()`.

Log of the Asrock B85M Pro4: https://paste.flashrom.org/view.php?id=3349

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Gerrit-Project: coreboot
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Gerrit-Change-Id: I00a23a5f2a46110536c344254868390dbb71854c
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