[Bug 237357] ThinkPad X240 doesn't resume from suspend with IOMMU DMAR enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237357

            Bug ID: 237357
           Summary: ThinkPad X240 doesn't resume from suspend with IOMMU
                    DMAR enabled
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology

With hw.dmar.enable=1, this Haswell laptop doesn't wake up from S3, similar
symptoms to what it was doing when the TPM was enabled: no reaction to lid open
/ power button press, power LED keeps blinking.

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