[Bug 229791] ig4 autoload breaks S3 (ig4iic_pci0 controller error during attach-2)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229791

            Bug ID: 229791
           Summary: ig4 autoload breaks S3 (ig4iic_pci0 controller error
                    during attach-2)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: aliovx at gmail.com

In reference to the commit r336141, which adds PNP table for the ig4 module,
when the module gets loaded on my Thinkpad T480, it drops the following
messages: 

ig4iic_pci0: <Intel Sunrise Point-LP I2C Controller-0> mem
0xec154000-0xec154fff at device 21.0 on pci0
ig4iic_pci0: Using MSI
ig4iic_pci0: controller error during attach-2
iicbus0: <Philips I2C bus> on ig4iic_pci0

Now with the module loaded, S3 suspend (which works perfectly without the
module being loaded) fails, last message I see is

[drm:wait_for_engines] Failed to idle engines, declaring wedged!

and then the system hangs.

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