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fanctrlplus2: warn when MSI nct6687 system fans need msi_fan_brute_force - #15
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On MSI boards using the nct6687 msi_alt1 register layout, writes to the system-fan channels are accepted but ignored unless the driver's msi_fan_brute_force option is set, leaving those fans at about 60% (#13). Show a notice on the settings page with the documented workaround when a configured fan uses such a channel and the option is not detected.
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📝 WalkthroughWalkthroughThe change detects missing MSI fan brute-force settings and monitors eligible fan channels for readings that remain at or below 60% when the target exceeds 60%. After 10 seconds, the plugin sends a per-fan warning. The settings page and README describe the workaround. ChangesMSI fan workaround detection and monitoring
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant FanLoop as fanctrlplus2_loop.sh
participant ChannelCheck as fcp_nct6687_msi_channel
participant StuckCheck as fcp_stuck_since
participant Notify as fcp_notify_stuck
FanLoop->>ChannelCheck: Check controller eligibility
ChannelCheck-->>FanLoop: Return monitoring status
FanLoop->>StuckCheck: Check target and actual PWM
StuckCheck-->>FanLoop: Return stuck start time or no active stretch
FanLoop->>Notify: Send warning after 10 seconds
Merge Risk: 🔵 Low · up to The MSI stuck-fan warning could be missed if it fires right after startup, before its marker directory exists. Creating the directory in the loop script fixes this. The risk is small. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 5 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Review comments at @src/usr/local/emhttp/plugins/fanctrlplus2/fanctrlplus2.page:
- Line 183: Update the `fcp-cmd` command in the page so enabling
`msi_fan_brute_force` does not overwrite existing `nct6687.conf` options; append
the option or write it to a separate configuration file, preserving any existing
`fan_config` and `fan_mask` settings.
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README.mdsrc/usr/local/emhttp/plugins/fanctrlplus2/css/fcp.base.csssrc/usr/local/emhttp/plugins/fanctrlplus2/fanctrlplus2.pagesrc/usr/local/emhttp/plugins/fanctrlplus2/include/Common.phptests/nct6687_notice_test.php
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| <strong>MSI board detected:</strong> the nct6687 driver may ignore speed changes on system fans, which then stay at about 60%. | ||
| The driver's documented workaround is its <code>msi_fan_brute_force</code> option. Run the commands below from an Unraid terminal, then reboot: | ||
| <code class="fcp-cmd">mkdir -p /boot/config/modprobe.d</code> | ||
| <code class="fcp-cmd">echo "options nct6687 msi_fan_brute_force=1" > /boot/config/modprobe.d/nct6687.conf</code> |
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When /boot/config/modprobe.d/nct6687.conf already contains settings such as fan_config=msi_alt1 or fan_mask, copying this command truncates the file before writing the new option. After reboot, those existing settings are silently lost, potentially selecting the wrong register mapping or removing configured fan channels; append the option (as the README command does) or update the existing options line without replacing the file.
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Already fixed in 8ee08d4, after the reviewed commit: the notice now appends with >>.
…notify on stuck fans The notice now takes msi_fan_brute_force from the driver's kernel log line when present, so options passed outside modprobe.d are honoured and an unapplied modprobe.d edit is not. The fan loop also reads back nct6687 MSI system-fan channels. When a fan set above 60% reads back lower on two ticks in a row, it sends one Unraid notification per fan per boot.
Count only ticks that wrote nothing, skip drivers that already run in brute-force mode, never notify without a flag file, and read only the tail of syslog.
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A fan counts as stuck while its last written target is above 60% and it reads back 60% or less. The tick that sets the speed starts the clock; the warning follows once the stretch has lasted 10 seconds, so a target raised on every tick no longer postpones it.
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Inline comments:
Review comments at
@src/usr/local/emhttp/plugins/fanctrlplus2/scripts/fanctrlplus2_loop.sh:
- Around line 196-198: Create the `/var/tmp/${plugin}` marker directory before
the fan loop can call `fcp_notify_stuck`; initialize it near the `plugin`
assignment in the loop startup flow so notifications work even before the
dashboard updater starts.
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README.mdsrc/usr/local/emhttp/plugins/fanctrlplus2/scripts/disk_group_control.shsrc/usr/local/emhttp/plugins/fanctrlplus2/scripts/fanctrlplus2_loop.shtests/nct6687_stuck_test.sh
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| stuck_since=$(fcp_stuck_since "$stuck_since" "$SECONDS" "$prev_pwm" "$actual_pwm") | ||
| if [[ -n "$stuck_since" ]] && (( SECONDS - stuck_since >= 10 )); then |
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When interval_sec exceeds 10 seconds (the default is 120 and the supported maximum is 3600), this condition is evaluated only once per control-loop iteration and is followed by the full interval sleep. A stuck stretch first observed here therefore cannot notify after 10 seconds; it notifies only on the next tick—up to an hour later—or not at all if the requested PWM falls below 60% before that tick. Schedule a follow-up read after the remaining 10-second window or poll this check independently of the temperature-control interval.
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Intended. The check follows the control loop's cadence by design: it warns after 10 seconds' worth of ticks plus the tick that set the speed, so at a 120 s interval that is the second tick. A fan stuck at 60% isn't urgent, and the condition persists, so a later tick still catches it. Users who choose a long interval accept slower reaction from every part of the loop, this check included.
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| foreach (glob($modprobe_glob) ?: [] as $conf) { | ||
| if (preg_match($set, (string)@file_get_contents($conf))) return false; |
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When an older driver exposes neither the watchdog attribute nor the kernel-log status, this returns as soon as any configuration file contains an enabled occurrence. modprobe.d combines all options, so a later msi_fan_brute_force=0 can override an earlier =1; in that case the driver loads with the workaround disabled while this function suppresses the settings notice. Parse the effective ordered options and use the final value instead of treating any match as enabled. The modprobe.d manual confirms that all module options are added together.
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Fixed in a458c6f: files are read in name order and every occurrence is considered, so the last setting wins, as with modprobe.
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1 participant
On MSI boards where the nct6687 driver uses its
msi_alt1register layout, writes to the system-fan channels (pwm3and up) are accepted but not applied unless the driver'smsi_fan_brute_forcemodule option is set. Those fans then stay at about 60% (#13, driver documentation).Settings-page notice. Shows the documented Unraid workaround when all of these hold:
pwm3or higher)./sys/module/nct6687/parameters/fan_configreadsmsi_alt1.fan_control_watchdogattribute (created only in brute-force mode by newer builds); the driver'sMSI fan brute force mode: enabled|disabledkernel log line (syslog tail and dmesg, latest load wins; printed on auto-detected MSI boards); theoptions nct6687lines in/etc/modprobe.d.Live check. For fans on such a channel (and no
fan_control_watchdog), the fan loop readspwmNback on every tick. When the last written target is above 60% but the fan reads back 60% or less for 10 seconds, it sends one Unraid warning notification per fan per boot. The tick that sets the speed starts the clock, so the warning needs 10 seconds' worth of ticks plus that one.Tests:
tests/nct6687_notice_test.phpandtests/nct6687_stuck_test.sh;bash tests/run-all.shpasses. Smoke-ranfanctrlplus2_loop.shagainst a fake sysfs with a 10 s interval and a target rising every tick: a fan pinned at 154 got one notification on the second tick (18 s in), and a fan that follows its target got none.Summary by CodeRabbit
New Features
Documentation