Kernel driver nzxt-kraken3

Supported devices:

  • NZXT Kraken X53

  • NZXT Kraken X63

  • NZXT Kraken X73

  • NZXT Kraken Z53

  • NZXT Kraken Z63

  • NZXT Kraken Z73

Author: Jonas Malaco, Aleksa Savic

Description

This driver enables hardware monitoring support for NZXT Kraken X53/X63/X73 and Z53/Z63/Z73 all-in-one CPU liquid coolers. All models expose liquid temperature and pump speed (in RPM), as well as PWM control (either as a fixed value or through a temp-PWM curve). The Z-series models additionally expose the speed and duty of an optionally connected fan, with the same PWM control capabilities.

Pump and fan duty control mode can be set through pwm[1-2]_enable, where 1 is for the manual control mode and 2 is for the liquid temp to PWM curve mode. Writing a 0 disables control of the channel through the driver after setting its duty to 100%.

The temperature of the curves relates to the fixed [20-59] range, correlating to the detected liquid temperature. Only PWM values (ranging from 0-255) can be set. If in curve mode, setting point values should be done in moderation - the devices require complete curves to be sent for each change; they can lock up or discard the changes if they are too numerous at once. Suggestion is to set them while in an another mode, and then apply them by switching to curve.

The devices can report if they are faulty. The driver supports that situation and will issue a warning. This can also happen when the USB cable is connected, but SATA power is not.

The addressable RGB LEDs and LCD screen (only on Z-series models) are not supported in this driver, but can be controlled through existing userspace tools, such as liquidctl.

Usage Notes

As these are USB HIDs, the driver can be loaded automatically by the kernel and supports hot swapping.

Possible pwm_enable values are:

0

Set fan to 100%

1

Direct PWM mode (applies value in corresponding PWM entry)

2

Curve control mode (applies the temp-PWM duty curve based on coolant temp)

Sysfs entries

fan1_input

Pump speed (in rpm)

fan2_input

Fan speed (in rpm)

temp1_input

Coolant temperature (in millidegrees Celsius)

pwm1

Pump duty (value between 0-255)

pwm1_enable

Pump duty control mode (0: disabled, 1: manual, 2: curve)

pwm2

Fan duty (value between 0-255)

pwm2_enable

Fan duty control mode (0: disabled, 1: manual, 2: curve)

temp[1-2]_auto_point[1-40]_pwm

Temp-PWM duty curves (for pump and fan), related to coolant temp