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    SubjectFailure to shutdown/reboot with intel_iommu=on
    Hello,

    On my Lenovo T460p I cannot shutdown and reboot when the iommu is
    enabled. This is using linux 5.2.7 as provided by Debian, 5.6.4 has the
    same problem. Suspend/resume also fails; I suspect this is the same
    issue.

    When requesting power off the kernel messages just end with:

    sd 0:0:0:0: [sda] Synchronizing SCSI cache
    sd 0:0:0:0: [sda] Stopping disk
    e1000e: EEE TX LPI TIMER: 00000011
    ACPI: Preparing to enter system sleep state S5
    reboot: Power down
    acpi_power_off called

    (photo at https://www.kleine-koenig.org/tmp/uklsiommu.jpg in case I
    mistyped something. Full dmesg and lspci -vvv at
    https://www.kleine-koenig.org/tmp/uklsiommu.tar.gz with and without
    iommu enabled.)

    With the iommu disabled (CONFIG_INTEL_IOMMU_DEFAULT_ON unset or
    intel_iommu=off on cmdline) the machine just works as expected
    (including working suspend/resume).

    I already talked to tglx on irc but unfortunately no new insights
    resulted from that.

    Any ideas how to fix or continue debugging the issue?

    Best regards
    Uwe
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