Auto-reboot a frozen Linux host with the chipset hardware watchdog (AMD sp5100_tco) — Part 1 systemd for total lockups, Part 2 a gated watchdogd probe for partial freezes; includes the modprobe blacklist + initramfs persistence gotchas
Configure the AMD chipset hardware watchdog so a total system freeze auto-reboots the machine instead of needing a manual power-cycle. Written for an unattended host (a bot box on an AMD APU whose iGPU occasionally hard-hangs under GPU compute and freezes the whole system, leaving nothing in the logs).
Two layers — read both: