What is the problem?
According to https://docs.octoprint.org/en/master/plugins/hooks.html#firmware_info_hook, Octoprint reads the firmware's version from the output of M115 which is expected to be formatted as
FIRMWARE_NAME:Some Firmware Name FIRMWARE_VERSION:1.2.3 PROTOCOL_VERSION:1.0
However, current Marlin version(s) report to M115 like this:
FIRMWARE_NAME:Marlin bugfix-2.0.x (GitHub) SOURCE_CODE_URL:https://github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:3D Printer EXTRUDER_COUNT:1 UUID:11111111-2222-3333-4444-555555555555
What did you already try to solve it?
Looked at Marlin GitHub for related changes, no success.
serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
Log from Terminal Tab:
[...] Send: M115 Recv: FIRMWARE_NAME:Marlin bugfix-2.0.x (GitHub) SOURCE_CODE_URL:https://github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:3D Printer EXTRUDER_COUNT:1 UUID:11111111-2222-3333-4444-555555555555 Recv: Cap:SERIAL_XON_XOFF:0 Recv: Cap:BINARY_FILE_TRANSFER:0 Recv: Cap:EEPROM:1 Recv: Cap:VOLUMETRIC:1 Recv: Cap:AUTOREPORT_TEMP:1 Recv: Cap:PROGRESS:0 Recv: Cap:PRINT_JOB:1 Recv: Cap:AUTOLEVEL:0 Recv: Cap:Z_PROBE:1 Recv: Cap:LEVELING_DATA:0 Recv: Cap:BUILD_PERCENT:0 Recv: Cap:SOFTWARE_POWER:0 Recv: Cap:TOGGLE_LIGHTS:0 Recv: Cap:CASE_LIGHT_BRIGHTNESS:0 Recv: Cap:EMERGENCY_PARSER:0 Recv: Cap:PROMPT_SUPPORT:0 Recv: Cap:AUTOREPORT_SD_STATUS:0 Recv: Cap:THERMAL_PROTECTION:1 Recv: Cap:MOTION_MODES:0 Recv: Cap:CHAMBER_TEMPERATURE:0 Recv: ok Send: M155 S2 Recv: ok [...]
Please let me know if further logs are required/helpful.
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)
OctoPrint v1.4.0rc3, Wanhao Duplicator i3, Marlin bugfix-2.0.x as of 3.1.2020, Chrome, Windows 10
I know that this is more a Marlin topic than an OctoPrint issue...but as I came across this while trying to make the OctoPrint Marlin EEPROM plugin work with bugfix-2.0.x, and because I wildly guess that your connections to the Marlin devs are much closer than mine, I post this here...I'll however also post this in the Marlin forum.