Sytem not recogniziong /dev/ttyUSB* ports

English Hardware
1

I am using Leap 15.2 with AMD Athlon CPU. The system is not recognizing attached USB devices. The problem appeared from nowhere as it was working 3 days ago. Further, altho the is a /dev/ttyUSB0 device, assigning the Arduino to that port does not work and I question if /dev/ttyUSB0 is actually functional.

The devices are a Arduino and a Digilent Nexys FPGA board. Needless to say I cannot program ether device and my development efforts are at a standstill until the problem is solved.

I would like to fix it so the attached USB devices are recognized at boot time, but in lieu of that solution, how does one mount these generic devices?

Many thanks,

H

various commands:

ls /dev/ttyUSB*
/dev/ttyUSB0

3 days ago I had /dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2

dmesg | grep tty
0.000000] printk: console [tty0] enabled
2.501118] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
6.906187] usb 6-4: cp210x converter now attached to ttyUSB0

2

When you are sure that you did not update the system (or installed new osftware) since it “worked”, I am always inclined to say “check the hardware”. But I assume you did that already.

3

As Henk has speculated, this may well be a hardware issue. At the very least you should run dmesg in a terminal

dmesg -w

and observe/capture the output while plugging in the device. Report back here with that output. Please use CODE tags when posting such commands and output. (Refer to the ‘#’ button in the forum editor.)