[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 #17 from Mike Karels <karels at freebsd.org> ---
Setting sysctl hw.usb.disable_enumeration=1 makes the messages stop. The UPS
does not appear to work; I stopped apcupsd, and apctest cannot open the device.
Clearing the sysctl makes the messages start again, but apctest does not work.
Unfortunately, I did not try apctest before setting the sysctl.

Booting with debug.acpi.disabled="usb" did not seem to change anything: the
messages continued, apcupsd complained about losing communication, and apctest
didn't work.  hw.usb.disable_enumeration=1 still stopped the messages, but
apcupsd still complains about lost communiction.  I can test the rest this
evening.

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