https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245654

--- Comment #10 from Vladimir Kondratyev <[email protected]> ---
(In reply to xspbe3ho3p5uac from comment #9)

There are only 6 /dev/iic* rather than 7. One device is still not configured.

It looks like your ACPI BIOS has so called I2C OpRegion handler. I ported
support for it from DragonFlyBSD recently but it is disabled by default as non
tested.
It is used by ACPI BIOS to communicate with peripheral devices e.g. battery
charge controllers over I2C bus. It can be enabled with placing following line
to /boot/loader.conf:

hw.iicbus.enable_acpi_space_handler=1

You should reboot after that. I do not know how to test it though. Maybe
verbose boot will reveal some debugging messages.

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