[Bug 234595] Suspend/resume issues with PCI bus on ThinkPad T420

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234595

            Bug ID: 234595
           Summary: Suspend/resume issues with PCI bus on ThinkPad T420
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: kevinz5000 at gmail.com

Created attachment 200741
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200741&action=edit
dmesg output

Issuing:

# zzz

On a ThinkPad T420, either with CSM or UEFI boot, gives:

pci0: failed to set ACPI power state D3 on \134_SB_.PCI0.VID_: AE_BAD_PARAMETER
pcib0: failed to set ACPI power state D2 on \134_SB_.PCI0: AE_BAD_PARAMETER
acpi0: cleared fixed power button status

Then, either after the screen goes blank, or on resume, some things on the PCI
bus end up broken. For me, it's the ehci controller and ethernet (em)
controller.

ehci_interrupt: unrecoverable error, controller halted
cmd=0xffffffff
...
sts=0xffffffff
...
ien=0xffffffff
frindex=0xffffffff ctrdsegm=0xffffffff periodic=0xffffffff async=0xffffffff
port 1 status=0xffffffff
port 2 status=0xffffffff
port 3 status=0xffffffff
...
ehci_interrupt: blocking interrupts 0x10

em does not give any dmesg output, continues to show up in ifconfig, but does
not seem to work.

Suspend/resume worked on this machine in 11.2-RELEASE. I suspect something
broke with the ACPI upgrade, but will keep investigating.

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