ryzen_smu 0.1.7 fails to initialize on Krackan / Ryzen AI 5 340 (CPUID 0x00B60F00, PCI 1022:1122)

[steveej]

Summary

ryzen_smu loads on my Framework Laptop 13 AMD, but fails to initialize on a Krackan-based Ryzen AI 5 340.

Because initialization fails, /sys/kernel/ryzen_smu_drv is never created, and ryzenadj falls back to /dev/mem instead of using the kernel module.

This looks like model detection/support is incomplete for this CPU generation.

Hardware / software

• Laptop: Framework Laptop 13 AMD
• CPU: AMD Ryzen AI 5 340
• Codename seen from userspace: Krackan
• PCI ID: 1022:1122
• Distro: NixOS
• Kernel: 6.18.15
• ryzen_smu: 0.1.7
• ryzenadj: 0.17.0

Reproduction

1. Install/load ryzen_smu
2. Reboot
3. Check for sysfs interface:

   sudo ls -lah /sys/kernel/ryzen_smu_drv

4. Check kernel log:

   sudo journalctl -k -b | rg -i 'ryzen_smu|smu'

5. Run ryzenadj:

   sudo ryzenadj --info

   or

   sudo ryzenadj --fast-limit=20000 --slow-limit=16000 --stapm-limit=16000 --tctl-temp=85 --info

Actual behavior

/sys/kernel/ryzen_smu_drv does not exist.

Kernel log shows:

ryzen_smu: loading out-of-tree module taints kernel.
ryzen_smu: loading version: 0.1.7
ryzen_smu: CPUID: family 0x1A, model 0x60, stepping 0x0, package 0x1
ryzen_smu: CPUID: Unknown Zen5/6 processor model: 0x60 (CPUID: 0x00B60F00)
ryzen_smu: Failed to initialize the SMU for use

And ryzenadj reports:

no compatible ryzen_smu kernel module found, fallback to /dev/mem

Expected behavior

ryzen_smu should initialize successfully on this CPU, expose /sys/kernel/ryzen_smu_drv/*, and be usable by ryzenadj without /dev/mem fallback.

Additional details

modinfo ryzen_smu shows:

version:        0.1.7
alias:          pci:v00001022d00001122sv*sd*bc*sc*i*

lspci -nn shows:

00:00.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Krackan Root Complex [1022:1122]

So the module appears to match the PCI ID, but still fails during CPU/model initialization.

If useful, I can test a patch or provide more logs.