kern/56996: i915 takes over console eroneously

[martin%NetBSD.org@localhost]

>Number:         56996
>Category:       kern
>Synopsis:       i915 takes over console eroneously
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 05 12:35:01 +0000 2022
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.99
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD seven-days-to-the-wolves.aprisoft.de 9.99.99 NetBSD 9.99.99 (GENERIC) #577: Mon Sep 5 14:12:13 CEST 2022 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:

I have a machine that boots with serial console and normally does not have
kbd/display connected or used.

But a -current GENERIC kernel still tries to use framebuffer console:

[..]
acpivga0:   0x0400 (acpiout15): Unknown Output Device, head 0
lpt0 at acpi0 (LPTE, PNP0400-0): io 0x378-0x37f irq 5
allocated pic ioapic0 type edge pin 5 level 6 to cpu0 slot 1 idt entry 97
com0 at acpi0 (UAR1, PNP0501-0): io 0x3f8-0x3ff irq 4
com0: ns16550a, 16-byte FIFO
com0: console
[..]
wsdisplay0 at intelfb0 kbdmux 1: console (default, vt100 emulation)
wsmux1: connecting to wsdisplay0
wskbd0: connecting to wsdisplay0


>How-To-Repeat:

Boot a i915 machine with serial console?

>Fix:
n/a