VectorW

NCT6687 PWM control fails on Unraid 7.3.3 – ASRock Z370M Pro4 Hello, After upgrading from Unraid 7.3.2 to 7.3.3, manual PWM fan control stopped working in CoolerControl. Fan RPM readings remain available, but switching PWM channels to manual mode fails with Input/output error (os error 5). Downgrading to Unraid 7.3.2 restores full functionality without changing CoolerControl or BIOS settings. System information- Motherboard: ASRock Z370M Pro4 - Controller: Nuvoton NCT6683D, EC firmware 1.0 (07/18/16) - Driver: NCT6687 plugin by ich777 - CoolerControl: Docker container Working vs. failing versions| | Working | Failing | |---|---|---| | Unraid | 7.3.2 | 7.3.3 | | Kernel | 6.18.38 | 6.18.54 | | Driver package | nct6687d-20260629 | nct6687d-20260915 | | Module version | 1.0.0 | 1.0.0 | | srcversion | 0B3847622B683F9C93DA9D9 | F9122C161007B8F98A39714 | | Manual PWM | Working | EIO error | Errors on Unraid 7.3.3CoolerControl: Unable to set pwm_enable for /sys/class/hwmon/hwmon1/pwm1_enable to 1 Error: Input/output error (os error 5) Unable to set pwm_enable for /sys/class/hwmon/hwmon1/pwm2_enable to 1 Error: Input/output error (os error 5) Kernel (dmesg): nct6687: Forcibly enabling EC access. Data may be unusable. nct6687: Found NCT6683D or compatible chip at 0x002e:0x0a10 nct6687: NCT6683D EC firmware version 1.0 build 07/18/16 nct6687: Failed waiting for new configuration to be accepted nct6687: Fan registers are still accessiblePWM state on 7.3.3: pwm1: 165 pwm1_enable: 2 fan1_input: 781 pwm2: 165 pwm2_enable: 2 fan2_input: 1331 Debugging performed1. Verified that only nct6687 is loaded and bound to the controller (/sys/bus/platform/drivers/nct6687). 2. Confirmed that the built-in nct6683 driver is blacklisted. 3. Checked module parameters: fan_config=default, fan_mask=255, temp_mask=127. 4. Verified that RPM monitoring works, but switching PWM1/PWM2 to manual mode fails. 5. Performed a full shutdown with AC power disconnected overnight; no improvement. 6. Downgraded to Unraid 7.3.2 with its matching NCT6687 driver package; CoolerControl works normally again.