Lenovo Laptop P50 and P70 fails to completely shutdown or suspend when booted with intel_iommu=on kernel parameter.

Solution Verified - Updated -

Issue

  • Lenovo Laptop P50 and P70 fails to completely shutdown or suspend when booted with intel_iommu=on kernel parameter.
ACPI: Preparing to enter system sleep state S5
Power down.    <-- stuck here
  • Following DMAR fault will be visible in dmesg logs.
[    2.051572] DMAR: [DMA Read] Request device [00:12.4] PASID ffffffff fault addr a7fff000 [fault reason 02] Present bit in context entry is clear

Environment

  • Lenovo P50 or P70 model.
  • intel_iommu=on kernel parameter.
  • TPM 2.0

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