[Bug 237666] repeated messages of "uhub_reattach_port: giving up port reset - device vanished"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237666

--- Comment #32 from Mike Karels <karels at freebsd.org> ---
Yes, I started seeing these when I upgraded from FreeBSD 11.3 (RELEASE) to
12.0-RELEASE-p9 about a week ago.  I have /var/log/messages from 11.3 for
comparison. btw, I added your xhci patch to the system with no
EARLY_AP_STARTUP, although it probably doesn't matter.  I'll note that 12.0 is
older than 11.3 in various ways; I should probably try 12-stable.

fwiw, this is a Gigabyte GA-X99P-SLI motherboard (rev. 1.0) with Intel Core
i7-5820K, 6 cores plus hyperthreading, several years old, and has run many
versions of FreeBSD.  I believe the chipset is an Intel X99; I could research
the details.  I might be able to reboot 11.3 if it mattered (it's on an
alternate partition, but I don't know how to boot it using UEFI).

Thanks for looking into this!

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