kern/56797: timestamps messed up in quiet boot dmesg

[uwe%stderr.spb.ru@localhost]

>Number:         56797
>Category:       kern
>Synopsis:       timestamps messed up in quiet boot dmesg
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 15 12:55:00 +0000 2022
>Originator:     Valery Ushakov
>Release:        NetBSD-9.99.96
>Organization:
>Environment:
>Description:
When you boot quietly with -q the timestamps in the autoconf output
are all messed up.  Some of them are at the beginning of the line,
some are only after the "dev42 at bus666" part of the message, some
have no timestamp at all.  E.g. booting amd64 kernel with -q has in
the dmesg something like:

[     1.000003] timecounter: Timecounter "ACPI-Safe" frequency 3579545 Hz quality 900
pckbc1 at acpi0 (PS2K, PNP0303) (kbd port): io 0x60,0x64 irq 1
pckbc2 at acpi0 (PS2M, PNP0F03) (aux port): irq 12
attimer1 at acpi0 (TIMR, PNP0100): io 0x40-0x43,0x50-0x53
com0 at acpi0 (SRL0, PNP0501-1): io 0x3f8-0x3ff irq 4
[     1.030283] com0[   1.0302834] : ns16550a, 16-byte FIFO
[     1.030283] com0: console
acpivga0 at acpi0 (GFX0)[   1.0302834] : ACPI Display Adapter
acpiout0 at acpivga0 (VGA, 0x0100)[   1.0302834] : ACPI Display Output Device
[     1.030283] acpivga0: connected output devices:
[     1.030283] acpivga0:   0x0100 (acpiout0): VGA Analog Monitor, index 0, port 0, head 0
acpibat0 at acpi0 (BAT0, PNP0C0A-0)[   1.0302834] : ACPI Battery
acpiacad0 at acpi0 (AC, ACPI0003-0)[   1.0302834] : ACPI AC Adapter
pckbd0 at pckbc1 (kbd slot)
[     1.030283] pckbc1: using irq 1 for kbd slot
wskbd0 at pckbd0 mux 1
pms0 at pckbc1 (aux slot)
[     1.030283] pckbc1: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pci0 at mainbus0 bus 0: configuration mode 1
[     1.030283] pci0: MSI/MSI-X OK because VM guest.


The console output is mostly ok, but has a couple of gliches too, e.g.

[   1.0302834] Found vioif0 at virtio0
[   1.0302834] Found auich0 at pci0: Audio controller
[   1.0302834] Found ohci0 at pci0[   1.0302834] : USB Controller
...
[   1.0302834] Found ehci0 at pci0[   1.0302834] : USB controller

>How-To-Repeat:
Boot with -q, check console output and the dmesg.
>Fix: