fix(asusd): debounce platform profile change events to prevent EC lockup - #341
fix(asusd): debounce platform profile change events to prevent EC lockup#341scardracs wants to merge 1 commit into
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📝 WalkthroughSummary by CodeRabbit
WalkthroughPlatform-profile watcher events now use a 500 ms trailing debounce. Profile-dependent hardware updates run after the event stream becomes quiet. Pending updates are applied when the stream terminates. ChangesPlatform Profile Debounce
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The change debounces rapid profile updates before applying hardware settings, but an inotify read error could still be interpreted as a profile change and trigger an unnecessary hardware update. This is a bounded mergeable risk that should be fixed or explicitly accepted by the owner. Suggested labels: Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@asusd/src/ctrl_platform.rs`:
- Around line 1119-1121: Update the debounced stream handling around the EOF
branch to retain any pending event and wait for the remaining debounce duration
before invoking on_settled, then exit. Preserve immediate termination when no
event is pending, and add a test covering one event followed by immediate
channel closure that verifies exactly one callback.
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🔇 Additional comments (1)
asusd/src/ctrl_platform.rs (1)
1108-1108: 🩺 Stability & AvailabilityKeep the
Duration::MAXdormant timer.Tokio 1.53.1 handles overflow with
checked_addand usesInstant::far_future()when necessary, so this initialization does not panic.> Likely an incorrect or invalid review comment.
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Inline comments:
In `@asusd/src/ctrl_platform.rs`:
- Around line 1065-1074: Update the logging in the watch_platform_profile
handling around get_platform_profile so the settled profile value is emitted at
info! level after profile is successfully read, identifying the final applied
profile; do not retain the current debug-only change notification as the primary
log.
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asusd/src/ctrl_platform.rs (1)
1051-1060: Flush the pending profile update before EOF.When
stream.next()returnsNonewhilependingis true, Line 1059 exits before the timer branch runs. The final profile then misses the EPP, signal, fan-curve, PPT, and Armoury-limit update. Keep the pending timer active after EOF, apply the settled update, and then exit.
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Inline comments:
In `@asusd/src/ctrl_platform.rs`:
- Around line 1051-1060: Update the stream-exit handling around the event loop
so EOF does not immediately break while pending is true: keep the debounce timer
active, await the remaining debounce duration, apply the pending profile once
through the existing update path, then exit the task. Preserve immediate exit
when no profile update is pending.
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Isn't this freeze a kernel bug? 500ms may be somewhat of a notable response delay for UI to update as well (among other things). Please discuss things like this with us before sending off a PR |
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Inline comments:
In `@asusd/src/ctrl_platform.rs`:
- Around line 1081-1088: Update the event handling around stream.next() to match
Some(Ok(_)) before setting pending and resetting debounce_timer. Handle
Some(Err(e)) separately by logging the error without triggering profile hardware
writes, while preserving the existing behavior for successful events.
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🔇 Additional comments (1)
asusd/src/ctrl_platform.rs (1)
1039-1080: LGTM!Also applies to: 1089-1103
It's both asusd and kernel bug. The good way to fix it would be to work on both sides but actually what I really want is for the user to stops to spam buttons, wait for 0.5 secs and then send the last decided value |
Rapid cycling of power profiles via the ROG hotkey (Fn+F3) causes a flood of inotify events on /sys/firmware/acpi/platform_profile. Previously, asusd processed each event immediately by writing all fan-curve tables, EPP policies, and PPT power limits over the ACPI/WMI channel. Under rapid keypresses, this heavy I/O flooded the Embedded Controller (EC) and conflicted with concurrent hotkey ACPI interrupts, causing the kernel AML interpreter to hang on ACPI semaphore acquisition (acpi_os_wait_semaphore down_timeout) and resulting in a hard system freeze with a remote CPU watchdog timeout (Issue OpenGamingCollective#328). Introduce an inline 500ms trailing debounce timer on the platform profile inotify stream loop using tokio::select! and a pinned sleep timer. Successive events reset the timer, ensuring heavy hardware I/O and EC writes occur exactly once for the final settled profile. If the inotify event stream closes while an update is pending, drain the remaining debounce period and apply the settled profile before exiting.
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Moving the fix directly into kernel |
2 participants
Description
Rapid cycling of power profiles via the ROG hotkey (
Fn+F3orFn+F5in my case) triggers a burst of inotify events on/sys/firmware/acpi/platform_profile. Previously,asusdimmediately processed every single intermediate event by writing all 3 fan-curve tables (CPU, GPU, MID), EPP policies, and PPT power limits directly over the ACPI/WMI channel.Because Embedded Controller (EC) communication is serialized in the kernel under the ACPI Global Lock / AML interpreter mutex, flooding the EC with heavy multi-register writes while simultaneous hotkey ACPI interrupts arrive causes the kernel AML interpreter to hang indefinitely on semaphore acquisition (
acpi_os_wait_semaphore->down_timeout). This leads to a remote CPU watchdog timeout and a complete hard system freeze.Key Changes
process_debounced_streamhelper usingtokio::select!withbiased;andstd::pin::pin!.info!level.ctrl_platform::testscovering burst coalescing and spaced event execution.Fixes #328
Tested Hardware & Environment
Verification and testing:
cargo fmt --all -- --check)cargo clippy --all -- -D warnings/cargo check --all-targets)cargo test --all)cargo cranky)