I have a USB-to-RS232 converter cable, the cable is proven to work in Windows machines, Ubuntu detects it but does not attach the converter to any /dev/tty.

I tried connecting it to USB 2.0 and 3.0, nothing.

Does not sow any error or anything.

The OS is Ubuntu 20.04, Kernel: 5.4.0-66-generic running on a 10th gen Intel i5, 8GB DDR4 RAM, Aorus ULTRA Z490I

"dmesg" tells me that it is in the system, but it's not attached to anything.

[12811.723685] usb 1-4: new full-speed USB device number 8 using xhci_hcd
[12811.872472] usb 1-4: New USB device found, idVendor=067b, idProduct=23c3, bcdDevice= 3.05
[12811.872474] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[12811.872474] usb 1-4: Product: USB-Serial Controller
[12811.872475] usb 1-4: Manufacturer: Prolific Technology Inc.
[12811.872476] usb 1-4: SerialNumber: EFA>f103Y23

"lsusb" shows that it is in fact detected

Bus 001 Device 008: ID 067b:23c3 Prolific Technology, Inc. USB-Serial Controller

"usb-devices" shows this:

T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=04 Dev#= 8 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=067b ProdID=23c3 Rev=03.05
S: Manufacturer=Prolific Technology Inc.
S: Product=USB-Serial Controller
S: SerialNumber=EFA>f103Y23
C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#=0x0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)

Edit:

I have an Ubuntu Laptop (It's the same Windows machine as tested it before but booted into Ubuntu) with same OS and Kernel, dmesg shows that It is detected and attached to ttyUSB0

[ 77.810199] usb 3-2: new full-speed USB device number 5 using xhci_hcd
[ 77.959158] usb 3-2: New USB device found, idVendor=067b, idProduct=23c3, bcdDevice= 3.05
[ 77.959163] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 77.959166] usb 3-2: Product: USB-Serial Controller
[ 77.959169] usb 3-2: Manufacturer: Prolific Technology Inc.
[ 77.959171] usb 3-2: SerialNumber: EFA>f103Y23
[ 78.122784] usbcore: registered new interface driver usbserial_generic
[ 78.122793] usbserial: USB Serial support registered for generic
[ 78.127135] usbcore: registered new interface driver pl2303
[ 78.127145] usbserial: USB Serial support registered for pl2303
[ 78.127169] pl2303 3-2:1.0: pl2303 converter detected
[ 78.127337] usb 3-2: pl2303 converter now attached to ttyUSB0

9 Sorted by: Reset to default

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