xsrc/52082: console switching in X does not work anymore

[martin%NetBSD.org@localhost]

>Number:         52082
>Category:       xsrc
>Synopsis:       console switching in X does not work anymore
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    xsrc-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 16 07:25:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.65
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD martins.aprisoft.de 7.99.65 NetBSD 7.99.65 (GENERIC) #123: Sun Mar 12 08:56:35 CET 2017 martin%martins.aprisoft.de@localhost:/ssd/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:

I can't switch virtual "consoles" via Ctrl-Alt-F1..F5 on this machine, at
least when X is running. The virtual consoles are configured:

wsdisplay0: screen 1 added (default, vt100 emulation)
wsdisplay0: screen 2 added (default, vt100 emulation)
wsdisplay0: screen 3 added (default, vt100 emulation)
wsdisplay0: screen 4 added (default, vt100 emulation)

This is with nouveau:
nouveau0 at pci1 dev 0 function 0: vendor 10de product 0e22 (rev. 0xa1)
nouveau0: interrupting at ioapic0 pin 18 (nouveau)
Zone  kernel: Available graphics memory: 5742800 kiB
Zone   dma32: Available graphics memory: 2097152 kiB
00001030
00010130
00002261
drm: Supports vblank timestamp caching Rev 2 (21.10.2013).
drm: Driver supports precise vblank timestamp query.
nouveaufb0 at nouveau0
nouveau0: info: registered panic notifier
nouveaufb0: framebuffer at 0xffff80012449d000, size 1920x1080, depth 32, stride 7680
wsdisplay0 at nouveaufb0 kbdmux 1
wsmux1: connecting to wsdisplay0

but:

com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console

>How-To-Repeat:
s/a

>Fix:
n/a