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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