[Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240339

--- Comment #11 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Greg V from comment #9)
> there's an RX underflow, but here (touchpad) that did not happen, none of these errors happened;
RX underflow has happened on attempt to read THQA certificate which is
discarded right after it has been read. So failure to read it is not fatal.
By my experience "RX underflow" is caused by ig4 bugs usually, but I am not
100% sure that it is a law.

> - with HAVE_IG4_POLLING in iichid, there's no RX underflow there (obviously), but it does not fix the lockup.
> I wonder if it might actually be iichid/imt doing something that causes the touchpad to do something wrong with the bus…
Really, I have never tested imt with touchpads. It still does not support
button state reporting and clickpad detection. So any bugs are possible.

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