[Bug 241036] efifb console lost during install in VM in UEFI mode - switches to serial

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241036

            Bug ID: 241036
           Summary: efifb console lost during install in VM in UEFI mode -
                    switches to serial
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: mason at blisses.org

Created attachment 208052
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=208052&action=edit
Final state of efifb

Running the 12.0-RELEASE installer in a UEFI VM sees a weird behaviour. We get
to
the line "smbus0: <System Managmeent Bus> on intsmb0" and that's the last line
displayed. I thought initially the VM was frozen, but it turns out (thanks to
RhodiumToad in IRC) that it's just switching over to serial at that point.

I checked backwards and forwards when I first noted this, and it started with
11.3, and 13-current also exhibited the behaviour. A notable change between
11.2
and 11.3 is that in the (working) 11.2 installer, the Beastie logo shows up in
colour, but in the (not working) 11.3 installer he is monochrome.

I've added a screenshot showing the console in its final state, and I've just
taken a couple more as the notion of immediately switching to the serial
console
occurred to me. I'll add those presently.

This might be related to BZ#237385 but there are differences. Primarily, I'm
not
specifying anything special for the install environment.

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