[Bug 218632] Loading of i915kms at boot time breaks cyapa (I2C)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218632

            Bug ID: 218632
           Summary: Loading of i915kms at boot time breaks cyapa (I2C)
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: denis at tambov.ru

Created attachment 181760
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181760&action=edit
it has two dmesg.boot files with and without i915kms module

I use 11.0-STABLE on a chromebook. One day I loaded i915kms module at boot time
and touchpad broke. I worked via cyapa driver which uses I2C bus.
If I boot the system without i915kms module, which uses I2C too, the cyapa
works.
Michael Gmelin suggested me to test CURRENT version, unfortunately, the
behaviour was the same.
The kernel shows me messages:
cyapa0: Unable to bring device out of bootstrap
cyapa0: Unable to initialize
iicbus0: <unknown card> at addr 0xce

If 11.0-STABLE booted without i915kms, cyapa works fine, then I start Xorg
which loads i915 (kms?) and that all works too.
The attachment contains two files /var/run/dmesg.boot with and without i915kms
module. The kernel was booted with -v flag.

Thanks.

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