Comment # 6 on bug 1233416 from Johannes Meixner

Tim K,
to avoid the issue you can disable
the CUPS baclend /usr/lib/cups/backend/serial
(which is not part of CUPS but of cups-filters)
as 'root' either by removing execute permissions
# chmod a-x /usr/lib/cups/backend/serial
or by deleting the /usr/lib/cups/backend/serial file.

Only offhanded guesses:

Do you have perhaps some hardware connected
via a serial port (also e.g. perhaps via some
USB to serial adapter or whatever else)?

Is your laptop perhaps connected to a docking station
where some serial hardware stuff exists or something
like that?

I know nothing about serial hardware and/or any software
related to serial hardware (including the kernel).

For comparison how it looks with openSUSE Leap 15.5
on my homeoffice workstation which is real hardware
(I have openSUSE only on a virtual machine)
long lines shown wrapped here:
--------------------------------------------------------
# dmesg | grep -i serial | grep -v 'SerialNumber'

[    0.980064] Serial: 8250/16550 driver, 32 ports,
 IRQ sharing enabled
[    0.980255] serial8250: ttyS0 at I/O 0x3f8
 (irq = 4, base_baud = 115200) is a 16550A
--------------------------------------------------------
# /usr/lib/cups/backend/serial && echo OK

serial serial:/dev/ttyS0?baud=115200 "Unknown"
 "Serial Port #1"
OK
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