[Bug 216123] ofwfb: r269278 broke booting on Power Mac G4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216123

--- Comment #7 from Kevin Bowling <kbowling at freebsd.org> ---
I don't think they need to be the same version, but you could revert the one
commit on the display system.  I've never used this though, so I can't validate
that it actually works still.  But it seems worth trying to see if there is a
useful panic string or whatever where the screen is going blank when debugging
is enabled, and you can also run kgdb remotely over it.

Otherwise maybe Nathan has enough context with your report now to take a look.

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