That’s odd. It does seem like Klipper is successfully being flashed and is successfully running. At first glance, the log seems to indicate that as soon as Linux recognizes the device (ttyACM0: USB ACM device) the device reboots (USB disconnect, device number ..). I wonder if there is something on Linux connecting to the device and causing it issues (eg, see ModemManager and similar at Other Single Board Computers (SBC) apart from Raspberry Pis ). It would be odd that the rp2350 would be impacted and not the rp2040 though.
You could look to see if there is information in other logs (besides dmesg). Other available logs vary depending on OS (sometimes journalctl -f works, sometimes one can look in files in /var/log/).
You could try flashing the same code I’m using to see if maybe it is something in the compilation process.
klipper-rp2350.zip (26.5 KB)
Though that also seems an unlikely explanation.
-Kevin