What is the problem?
I can´t connect my Sovol SV01 using a BTT SKR Mini E3 v1.2 anymore via USB. It worked well for quite a while and now doesn´t. I changed cable and even used other RPi hardware (3B and 4) - no result.
I activated the Serial log, posted below.
I tried to look for similiar issues but didn´t get further.
Thanks for any help or good ideas.
Systeminfo Bundle
browser.user_agent: Mozilla/5.0 (X11; Linux x86_64; rv:145.0) Gecko/20100101 Firefox/145.0
connectivity.connection_check: 1.1.1.1:53
connectivity.connection_ok: True
connectivity.enabled: False
connectivity.online: True
connectivity.resolution_check: octoprint.org
connectivity.resolution_ok: True
env.hardware.cores: 4
env.hardware.freq: 1500.0
env.hardware.ram: 1906548736
env.os.bits: 32
env.os.id: linux
env.os.platform: Linux-6.6.51+rpt-rpi-v7l-armv7l-with-glibc2.36
env.plugins.pi_support.model: Raspberry Pi 4 Model B Rev 1.1
env.plugins.pi_support.octopi_camera_stack: webcamd
env.plugins.pi_support.octopi_version: 1.1.0
env.plugins.pi_support.octopiuptodate_build: 1.1.0-1.11.6-20260127133909
env.plugins.pi_support.octopiuptodate_build_short: 2026.01.27.133909
env.plugins.pi_support.throttle_check_enabled: True
env.plugins.pi_support.throttle_check_functional: True
env.plugins.pi_support.throttle_state: 0x0
env.python.pip: 25.0.1
env.python.version: 3.11.2
env.python.virtualenv: True
octoprint.last_safe_mode.date: unknown
octoprint.last_safe_mode.reason: unknown
octoprint.safe_mode: False
octoprint.version: 1.11.6
systeminfo.generated: 2026-02-08T18:31:14Z
systeminfo.generator: zipapi
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
Logged into octopi via putty and executed the following commands:
lsusb
octopi@octopi:~ $ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 1d50:614e OpenMoko, Inc. stm32f103xe
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
octopi@octopi:~ $ dmesg | grep usb
[ 0.105215] usbcore: registered new interface driver usbfs
[ 0.105268] usbcore: registered new interface driver hub
[ 0.105328] usbcore: registered new device driver usb
[ 1.848951] usbcore: registered new device driver r8152-cfgselector
[ 1.849008] usbcore: registered new interface driver r8152
[ 1.849058] usbcore: registered new interface driver lan78xx
[ 1.849107] usbcore: registered new interface driver smsc95xx
[ 1.855432] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
[ 1.855466] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.855494] usb usb1: Product: xHCI Host Controller
[ 1.855514] usb usb1: Manufacturer: Linux 6.6.51+rpt-rpi-v7l xhci-hcd
[ 1.855535] usb usb1: SerialNumber: 0000:01:00.0
[ 1.856759] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 6.06
[ 1.856794] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.856822] usb usb2: Product: xHCI Host Controller
[ 1.856842] usb usb2: Manufacturer: Linux 6.6.51+rpt-rpi-v7l xhci-hcd
[ 1.856862] usb usb2: SerialNumber: 0000:01:00.0
[ 1.859000] usbcore: registered new interface driver uas
[ 1.859077] usbcore: registered new interface driver usb-storage
[ 1.865516] usbcore: registered new interface driver usbhid
[ 1.865538] usbhid: USB HID core driver
[ 2.144445] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 2.321221] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.21
[ 2.321274] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 2.321302] usb 1-1: Product: USB2.0 Hub
[ 2.668353] usb 1-1.1: new full-speed USB device number 3 using xhci_hcd
[ 2.827525] usb 1-1.1: New USB device found, idVendor=1d50, idProduct=614e, bcdDevice= 1.00
[ 2.827576] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.827607] usb 1-1.1: Product: stm32f103xe
[ 2.827628] usb 1-1.1: Manufacturer: Klipper
[ 2.827648] usb 1-1.1: SerialNumber: 35FFD805524E343530670543
[ 8.084668] usbcore: registered new interface driver cdc_acm
[ 8.449284] usbcore: registered new interface driver brcmfmac
Serial Log:
2026-02-08 18:57:50,711 - Changing monitoring state from "Offline" to "Opening serial connection"
2026-02-08 18:57:50,719 - Connecting to port /dev/ttyACM0, baudrate 115200
2026-02-08 18:57:50,741 - Changing monitoring state from "Opening serial connection" to "Connecting"
2026-02-08 18:57:50,743 - Connected to: Serial<id=0xacc791d8, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
2026-02-08 18:57:50,746 - Send: N0 M110 N0*125
2026-02-08 18:58:31,739 - No answer from the printer within the connection timeout, trying another hello
2026-02-08 18:58:31,740 - Send: N0 M110 N0*125
2026-02-08 18:58:46,738 - There was a timeout while trying to connect to the printer
2026-02-08 18:58:46,748 - Changing monitoring state from "Connecting" to "Offline"
2026-02-08 18:58:46,752 - Connection closed, closing down monitor
2026-02-08 19:05:03,932 - Changing monitoring state from "Offline" to "Detecting serial connection"
2026-02-08 19:05:03,952 - Performing autodetection with 7 port/baudrate candidates: /dev/ttyACM0@115200, /dev/ttyACM0@250000, /dev/ttyACM0@230400, /dev/ttyACM0@57600, /dev/ttyACM0@38400, /dev/ttyACM0@19200, /dev/ttyACM0@9600
2026-02-08 19:05:03,953 - Trying port /dev/ttyACM0, baudrate 115200
2026-02-08 19:05:03,954 - Connecting to port /dev/ttyACM0, baudrate 115200
2026-02-08 19:05:03,975 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:03,980 - Connected to: Serial<id=0xaf28bdc0, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=2.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
2026-02-08 19:05:03,986 - Send: N0 M110 N0*125
2026-02-08 19:05:05,985 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:05,993 - Send: N0 M110 N0*125
2026-02-08 19:05:08,757 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:08,765 - Send: N0 M110 N0*125
2026-02-08 19:05:10,765 - Trying port /dev/ttyACM0, baudrate 250000
2026-02-08 19:05:10,771 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:10,775 - Send: N0 M110 N0*125
2026-02-08 19:05:13,757 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:13,765 - Send: N0 M110 N0*125
2026-02-08 19:05:15,765 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:15,772 - Send: N0 M110 N0*125
2026-02-08 19:05:18,757 - Trying port /dev/ttyACM0, baudrate 230400
2026-02-08 19:05:18,762 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:18,768 - Send: N0 M110 N0*125
2026-02-08 19:05:20,766 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:20,773 - Send: N0 M110 N0*125
2026-02-08 19:05:23,757 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:23,767 - Send: N0 M110 N0*125
2026-02-08 19:05:25,766 - Trying port /dev/ttyACM0, baudrate 57600
2026-02-08 19:05:25,771 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:25,776 - Send: N0 M110 N0*125
2026-02-08 19:05:28,757 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:28,765 - Send: N0 M110 N0*125
2026-02-08 19:05:30,764 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:30,771 - Send: N0 M110 N0*125
2026-02-08 19:05:33,757 - Trying port /dev/ttyACM0, baudrate 38400
2026-02-08 19:05:33,761 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:33,768 - Send: N0 M110 N0*125
2026-02-08 19:05:35,769 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:35,776 - Send: N0 M110 N0*125
2026-02-08 19:05:38,758 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:38,765 - Send: N0 M110 N0*125
2026-02-08 19:05:40,765 - Trying port /dev/ttyACM0, baudrate 19200
2026-02-08 19:05:40,769 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:40,774 - Send: N0 M110 N0*125
2026-02-08 19:05:43,757 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:43,764 - Send: N0 M110 N0*125
2026-02-08 19:05:45,764 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:45,771 - Send: N0 M110 N0*125
2026-02-08 19:05:48,757 - Trying port /dev/ttyACM0, baudrate 9600
2026-02-08 19:05:48,762 - Handshake attempt #1 with timeout 2.0s
2026-02-08 19:05:48,767 - Send: N0 M110 N0*125
2026-02-08 19:05:50,768 - Handshake attempt #2 with timeout 2.0s
2026-02-08 19:05:50,775 - Send: N0 M110 N0*125
2026-02-08 19:05:53,757 - Handshake attempt #3 with timeout 2.0s
2026-02-08 19:05:53,764 - Send: N0 M110 N0*125
2026-02-08 19:05:55,765 - Changing monitoring state from "Detecting serial connection" to "Error"
2026-02-08 19:05:55,785 - Changing monitoring state from "Error" to "Offline after error"
2026-02-08 19:05:55,791 - Connection closed, closing down monitor