[Bug 211884] IPKVM cannot reliably enter text under 11.0-RC2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211884

--- Comment #1 from karl at denninger.net ---
Scanning back through recent commits I am wondering if this one is related....

r304124 | hselasky | 2016-08-15 03:58:55 -0500 (Mon, 15 Aug 2016) | 7 lines

MFC r303765:
Keep a reference count on USB keyboard polling to allow recursive
cngrab() during a panic for example, similar to what the AT-keyboard
driver is doing.

Found by:       Bruce Evans <brde at optusnet.com.au>

The reason this looks possibly-related is that the KVM attaches as a USB
keyboard.... and a plugged-in USB keyboard also exhibits the problem during the
boot-time process, as shown here from the boot log on one of the impacted
machines....

Enter passphrase for da8p4:
ugen1.2: <Winbond Electronics Corp> at usbus1
ukbd0: <Winbond Electronics Corp Hermon USB hidmouse Device, class 0/0, rev
1.10/0.01, addr 2> on usbus1
kbd2 at ukbd0

And...

uhid0: <Microsoft Comfort Curve Keyboard 2000, class 0/0, rev 2.00/1.73, addr
3> on usbus4

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