[Bug 253249] USB keyboard: repeated and out of order characters

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253249

            Bug ID: 253249
           Summary: USB keyboard: repeated and out of order characters
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: janm at transactionware.com

Created attachment 222162
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222162&action=edit
usbdump output when the problem is seen.

When typing quickly on a USB keyboard, some characters are repeated and some
appear out of order.

Attached is the output of usbdump and the console messages with
hw.usb.ukbd.debug=2 when typing "m_count" quickly. The characters presented are
"m_counntu".

Three different keyboards tested: Two from Unicomp and a Dell keyboard. The
Dell keyboard does slightly better but the problem still exists. I do not see
the problem when using the same keyboards on a Macintosh.

This appears to be similar to the problem here:
https://forums.freebsd.org/threads/mac-keyboard-weirdness-freebsd-12-2.77728/

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