What is the problem?
I am setting up octoprint for the first time on an old Linux laptop. I completed the setup process and got my webcam working but octoprint is unable to connect to my Ender 3. When I attempt to connect I get the error: "No more candidates to test, and no working port/baudrate combination detected."
In the serial port dropdown I have AUTO as well as /dev/ttyS0
through /dev/ttyS31
. I have tried each port individually with no success.
I see the following from dmesg
right after plugging in my printer via USB:
[21248.495354] usb 3-3: new full-speed USB device number 12 using xhci_hcd
[21248.648174] usb 3-3: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[21248.648178] usb 3-3: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[21248.648180] usb 3-3: Product: USB Serial
[21248.650331] ch341 3-3:1.0: ch341-uart converter detected
[21248.650684] usb 3-3: ch341-uart converter now attached to ttyUSB0
[21249.183405] input: BRLTTY 6.4 Linux Screen Driver Keyboard as /devices/virtual/input/input41
[21249.487936] usb 3-3: usbfs: interface 0 claimed by ch341 while 'brltty' sets config #1
[21249.488402] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[21249.488424] ch341 3-3:1.0: device disconnected
I never see /dev/ttyUSB0
as a port option in octoprint and I'm not sure why the device seems to instantly disconnect.
What did you already try to solve it?
- Swapping USB cables
- Restarting octoprint, printer, and laptop serving octoprint
- So much Googling
- Walking away for a few minutes.
Have you tried running in safe mode?
Yes
Did running in safe mode solve the problem?
Negative
Systeminfo Bundle
octoprint-systeminfo-20220714234351.zip (35.3 KB)
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
OctoPrint version: 1.8.1
Printer: Ender 3 (software: 2.0.8.2, hardware: 4.2.2)
OS (running octoprint): pop!_OS
My printer also has the backpowering flaw outlined here but I don't think that would be causing me issues on a laptop with a 120W power brick.