PPT (TDP) limits set via asusctl are silently discarded on kernels without `ppt_enabled`

[IoriAkatsuki]

Summary

On kernels where the asus-armoury driver does not expose a ppt_enabled firmware attribute, setting PPT limits (ppt_pl1_spl / ppt_pl2_sppt) via asusctl or rog-control-center is silently discarded. The tools report success and even read back the requested value, but the hardware limit never changes.

Environment

• asusctl/asusd 6.3.8
• Board: ROG Strix SCAR 17 (G634JZ), i9-13980HX
• Kernel 7.1.2 (mainline asus-armoury class, ≥6.19), asus_armoury loaded
• /sys/class/firmware-attributes/asus-armoury/attributes/ exposes ppt_pl1_spl, ppt_pl2_sppt but no ppt_enabled

Steps to reproduce

$ cat /sys/class/firmware-attributes/asus-armoury/attributes/ppt_pl1_spl/current_value
140
$ asusctl armoury set ppt_pl1_spl 65      # reports success
$ asusctl armoury get ppt_pl1_spl         # shows 65 (misleading)
$ cat /sys/class/firmware-attributes/asus-armoury/attributes/ppt_pl1_spl/current_value
140                                        # <-- unchanged, the write was dropped

Root cause (asusd/src/asus_armoury.rs)

1. set_current_value for a Ppt attribute only writes to sysfs when the current profile's Tuning.enabled == true; otherwise it logs Tuning is disabled: skipping ... and stores the value in config only.
2. The only thing that flips Tuning.enabled to true is the ppt_enabled firmware attribute. When the kernel does not expose a ppt_enabled sysfs node, that attribute is never registered, and there is no other code path setting tuning.enabled = true. So tuning stays disabled forever and every PPT write is skipped. (/etc/asusd/asusd.ron shows enabled: false for all profiles.)
3. current_value for Ppt returns the cached config value (or default) instead of reading sysfs, so get / the GUI report the requested value even though the firmware was never changed — which masks the failure.

Impact

Any board using mainline asus-armoury without a ppt_enabled node cannot change CPU TDP through asusctl / rog-control-center, and receives misleading "success" feedback.

Fix

PR incoming — auto-enable the profile's tuning on an explicit PPT set, and make the PPT getter read the real sysfs value.