Check if Debian Bullseye Bug causing Klipper to no longer find the printer board - #8 is applicable to your case.
If above does not help, then follow How-To Trouble-Shoot and post the dmesg.txt file
Check if Debian Bullseye Bug causing Klipper to no longer find the printer board - #8 is applicable to your case.
If above does not help, then follow How-To Trouble-Shoot and post the dmesg.txt file