[boyakhil978]

Adaptive tables can contain NotifyPlatform targets on the IETM participant. The Windows DTT stack passes the argument to the firmware through IETM.IMOK, so the firmware learns which adaptive target is active. thermald currently drops these targets (cdev IETM not found in the log).

The int3400 driver already exposes IMOK as the write-only imok sysfs attribute, so this change writes the target's argument there.

Why it matters

HP uses IMOK to set the EC's cooling mode. On the HP Spectre x360 14 (board 8C15, Meteor Lake), IMOK maps its argument to the EC field HPCM. The GDDV adaptive table has NotifyPlatform targets for every mode, including ones the BIOS profile switch never sets (In_bag_1, U_CS_Com_*, U_CS_Q1).

Testing (board 8C15)

• The EC was put in Cool mode by hand (echo 7 > imok, HPCM 0x02) with the BIOS profile on Balanced. The patched thermald then selects U_CS_B_A, logs NotifyPlatform 5, and HPCM returns to 0x01.
• In a separate 20-minute CPU+GPU load test in Performance on AC, the adaptive engine (2.5.13, before this change) selected U_CS_P_A and held SEN2 at or below 58 °C. Without adaptive mode, this laptop's EC powers it off after ~10 s at SEN2 ≥ 68 °C.

Related kernel fix, sent to platform-driver-x86: hp-wmi now masks the thermal profile query to its low byte. Without it, reading platform_profile returns -EINVAL on this board because the firmware packs flags and posture into the upper bytes.

🤖 Generated with Claude Code

[Copilot]

Warning

Copilot couldn't run its full agentic review because it didn't start before the timeout. Make sure your repository has a runner available, or add a copilot-code-review.yml file specifying one with the runs-on attribute. See the docs for more details.

Copilot review overview

2 open issues

• std::stoul returns unsigned long, but the result is stored in unsigned int without any range… · New
• Catching ... is overly broad here and can hide unexpected failures (including non-standard… · New

What changed in this PR

Adds support for Adaptive NotifyPlatform targets by writing the target argument to the int3400 imok sysfs attribute, allowing firmware/EC to learn the currently active adaptive target.

Changes:

• Add set_notify_platform() helper to handle NotifyPlatform adaptive targets.
• Update adaptive target execution to dispatch NotifyPlatform targets to the new helper.
• Parse the target argument and write it to ${int3400_base_path}imok with logging on failures.

File	Description
src/​thd_engine_adaptive.h	Declares the new set_notify_platform() helper for adaptive target execution.
src/​thd_engine_adaptive.cpp	Implements NotifyPlatform handling by parsing the argument and writing it to imok, and adds dispatch logic in execute_target().

_{Review effort: Lite}