Hi everyone, I’m running into a very strange and frustrating issue and I’m running out of ideas. Setup Raspberry Pi 4B Raspberry Pi OS Lite 64-bit (Bookworm) Klipper on a Voron 2.4 CAN bus setup using a Mellow Fly board CAN connected via umbelical at 500.000 bitrate and 128txlen New microSD (SanD…

I wish you had filled out the requested information for General Discussion questions because you haven’t given a full description of your system. I would like to know: What is your main controller board? On the same vein, what is the “Mellow Fly board” that you’re using for your toolhead or oth…

I didn’t ask for a klippy.log because when I read the OP, it seems that the rPi maxes out without the printer running. @Nesquirt if my interpretation of what you’re saying is wrong, then you need to include the klippy.log.

I’m using a btt octopus, using a dedicated usb can bridge (mellow utoc) connected to a toolhead sb2040 pro mellow. 2)i’m using the utoc. 3)As plugin i mean the extras in klipper like KAMP,crownsnest, etc.., when starting klipper first time all seems to be ok, after reboot all gone wrong, aslo wit…

As i start the printer, pi is connected on a dedicated 5v psu, connected to 24v, so when i power the printer it start, the 100% issue sometimes happen after 1 minutes from boot, sometimes instantly. I update a week ago maybe klipper,os and other components using kiauh and this issue happen, someone…

[image] Nesquirt: I update a week ago maybe klipper,os and other components using kiauh and this issue happen, The only suggestion that I have for you is to pull the rPi SD Card with a newly imaged one and start the install process again. Save the old SD Card in case the newly imaged one beh…

i update klipper likely every version, but this night i wanna try to reinstall the os on a new microsd, install klipper but likely the version released on 7jan as before the first week all works fine, i did a 48 hours print the 9th of january. After that setup can as i 've used until now, so 500k a…

[image] This one i uploaded is a clean OS also without klipper installed, only kiahu clone but not runned… also checked if i’ve any sort of undervoltage but nothing. [image] also i’ve disconnected my mainboard, UTOC and webcam from PI. only display is actually connected. [photo_2026-01-24_16…

You say “pids constantly changing” and I see that systemd is racking up a lot of cpu time. Perhaps a lot of processes are being (re)started. Does dmesg have any clues about the cause of all this activity?

after reflashing mcu for like 5 minutes it stay in normal states, after 5 minutes SPIKES goes back…so maybe its not related to version of klipper on mobo? I runned a dmesg command, ill attach the log dmesg only with BTT Octopus connected dmesg.txt (32.4 KB) dmesg with camera and Utoc connected d…

Raspberry Pi 4B CPU stuck at 100% on clean Bookworm install – Klipper seemingly not the cause

General Discussion

EddyMI3D January 23, 2026, 7:23am 3

In addition to @mykepredko : The klippy.log is missing.

Please also read here: How-To Ask for Help

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Raspberry Pi 4B CPU stuck at 100% on clean Bookworm install – Klipper seemingly not the cause

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