[Bug 246321] Key press timing/repeat issue on UEFI VNC console for OpenBSD => 6.6 guest

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246321

            Bug ID: 246321
           Summary: Key press timing/repeat issue on UEFI VNC console for
                    OpenBSD => 6.6 guest
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: jason at tubnor.net

When using the UEFI terminal console for an OpenBSD 6.6 or later guest, there
appears to be some sort of timing issue with the emulated VNC keyboard. After
booting the installer or and installed 6.6/6.7 operating system, a key press
can exhibit shorter than usual delay before repeat, therefor echoing more
characters than desired into the console as well as an increase in the
character repeat per second.

Another side affect is the login delay time. This is usually set to 300 seconds
on a a default install.  If you try logging into the console, this delay time
reduces to 58 seconds.

How to reproduce (this was tested on a variety of hardware including Xeon and
Atom based hosts):

Using 11.3 to 13-HEAD, configure a bhyve guest and install from miniroot66.fs
or miniroot67.fs

https://openbsd.cs.toronto.edu/pub/OpenBSD/6.6/amd64/miniroot66.fs
https://openbsd.cs.toronto.edu/pub/OpenBSD/snapshots/amd64/miniroot67.fs

Once at the Install/Upgrade prompt, select Shell.  Start typing a sentence as
you normally do to see the issue.

To replicate the shortened timeout issue on the login prompt, either try to get
the install down with the key press issue, install using miniroot65.fs[1] and
then perform a syspatch/sysupgrade to bring it up to 6.6 or install via
UEFI-serial and at the OpenBSD boot loader, issue 'set tty com0' to install via
the bhyve serial console.  Once installed, type root and the incorrect
password.  Start a timing device to see the difference between the reported 300
seconds of timeout and the actual time elapsed.

[1] An archive of an older, unsupported OpenBSD 6.5 release can be found here: 
https://mirror.cdn.ar18.org/pub/archive/OpenBSD/6.5/amd64/miniroot65.fs

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