Using SD card with Raspberry Pi OS 32 bit
Pi 3 OctoPrint connects with USB Cable to Elegoo Mega 2560 R3 arduino compatible and any sketch uploads and executes just fime.
dmesg displays:
[ 2065.775665] usb 1-1.2: USB disconnect, device number 4
[ 2069.398432] usb 1-1.2: new full-speed USB device number 5 using dwc_otg
[ 2069.543620] usb 1-1.2: New USB device found, idVendor=2341, idProduct=0042, bcdDevice= 0.01
[ 2069.543645] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=220
[ 2069.543662] usb 1-1.2: Manufacturer: Arduino (www.arduino.cc)
[ 2069.543677] usb 1-1.2: SerialNumber: 95038303531351714292
[ 2069.549003] cdc_acm 1-1.2:1.0: ttyACM0: USB ACM device
Using same Pi and USB cable to same Elegoo Mega 2560 R3 Octoprint fails to go 'online'
dmesg -w with OctoPi SD Card shows ONLY
[ 382.433366] usb 1-1.2: New USB device found, idVendor=2341,
idProduct=0042, bcdDevice= 0.01
[ 382.433388] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=220
[ 382.433404] usb 1-1.2: Manufacturer: Arduino (www.arduino.cc)
[ 382.433419] usb 1-1.2: SerialNumber: 95038303531351714292
[ 382.434596] cdc_acm 1-1.2:1.0: ttyACM0: USB ACM device
What did you already try to solve it?
enabled Allow Cross Origin Resource Sharing (CORS) - BNo change
Have you tried running in safe mode?
Yes - Same problerm
Did running in safe mode solve the problem?
No
Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
octoprint-systeminfo-20220212122215.zip (79.4 KB)
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
OctoPrint Verion Version 1.7.3, Using Ramps to control Printer but NOT plugged into Arduino in these tests, Google and Edge