[SOLVED] Serial Port not works anymore, after update to lastest version.

[Gilberto Ferreira]

Hi there.
We have a server with 2 serial ports which was found it but the pve kernel, as bellow:

dmesg | grep tty
[ 0.567999] printk: console [tty0] enabled
[ 1.005501] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 1.027682] 00:03: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A

We have had mapped this serial ports to the vm just like that
qm set 115 -serial0 /dev/ttyS0
qm set 115 -serial1 /dev/ttyS1

In the image I noteced this warning:


But inside the VM,with windows 10, the program used to communicate via serial port doesn't work anymore.
Any clue?

pveversion
pve-manager/7.4-3/9002ab8a (running kernel: 6.2.11-1-pve)

 

[dcsapak]

hi,
i tested it just now it works here without problems in a linux vm, did maybe something change in the guest instead?
or does it work if you e.g. use an older qemu machine version? (or even downgrade pve-qemu-kvm/kernel?)

 

[Gilberto Ferreira]

SOLVED with serial to usb cable.
Thanks