DDR4 drivers not binding to devices in current kernel versions

Start by reproducing python -m liquidctl list --unsafe smbus,ddr4_temperature -g on the reported Linux kernel and inspect the Ddr4Temperature and VengeanceRgb driver discovery paths. Check how the jc42 kernel driver affects binding; done means Corsair Vengeance RGB DDR4 devices are discovered and listed again.

Is there already an issue for this?

• There is no relevant open or closed issue for this

Is this a request for support of a new device?

• This is not a new device request

Affected liquidctl version

liquidctl v1.16.0.dev1+g7b6abfd9648e.d20250413 (Linux-6.18.3-arch1-1-x86_64-with-glibc2.42)

Affected device

Corsair Vengeance RGB (DDR4)

Is the device supported by that liquidctl version?

• The device is listead in the README as supported by my liquidctl version

Describe the bug

DDR4 drivers no longer bind to devices in current kernel versions. This appears to be related to the (not so) new jc42 kernel driver.

Commands executed

$ python -m liquidctl list --unsafe smbus,ddr4_temperature -g

Output of all relevant commands with --debug flag

$ python -m liquidctl list --unsafe smbus,ddr4_temperature -g
[DEBUG] (cli) (_log_env_infos): script: /home/jonas/Code/liquid/liquidctl/liquidctl/__main__.py
[DEBUG] (cli) (_log_env_infos): version: 1.16.0.dev1+g7b6abfd9648e.d20250413
[DEBUG] (cli) (_log_env_infos): platform: Linux-6.18.3-arch1-1-x86_64-with-glibc2.42
[DEBUG] (cli) (_log_env_infos): python: 3.13.11 (main, Dec  7 2025, 13:01:45) [GCC 15.2.1 20251112]
[DEBUG] (cli) (_log_env_infos): encoding: UTF-8 current, UTF-8 preferred, utf8_mode 0
[DEBUG] (cli) (_log_env_infos): with colorlog: 6.9.0
[DEBUG] (cli) (_log_env_infos): with crcmod: 1.7
[DEBUG] (cli) (_log_env_infos): with docopt: 0.6.2
[DEBUG] (cli) (_log_env_infos): with hidapi: 0.14.0
[DEBUG] (cli) (_log_env_infos): with pyusb: 1.3.0.post3+g0573e84d5ca9
[DEBUG] (cli) (_log_env_infos): with pillow: 12.1.0
[DEBUG] (cli) (_log_env_infos): with libusb-package: version n/a (No package metadata was found for libusb-package)
[DEBUG] (cli) (_log_env_infos): with winusbcdc: version n/a (No package metadata was found for winusbcdc)
[DEBUG] (cli) (_log_env_infos): with smbus: 1.1
[DEBUG] (smbus) (find_devices): searching LinuxI2c
[DEBUG] (smbus) (find_devices): LinuxI2c drivers: Ddr4Temperature, EvgaPascal, RogTuring, VengeanceRgb
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-3 (NVIDIA i2c adapter 4 at 1:00.0)
[DEBUG] (smbus) (find_devices): I²C adapter: 0-001b skipped: not a bus or unsupported adapter
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-1 (NVIDIA i2c adapter 1 at 1:00.0)
[DEBUG] (smbus) (find_devices): I²C adapter: 0-0019 skipped: not a bus or unsupported adapter
[DEBUG] (smbus) (find_devices): I²C adapter: 0-0037 skipped: not a bus or unsupported adapter
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-6 (NVIDIA i2c adapter 8 at 1:00.0)
[DEBUG] (smbus) (find_devices): I²C adapter: 0-0053 skipped: not a bus or unsupported adapter
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-4 (NVIDIA i2c adapter 6 at 1:00.0)
[DEBUG] (smbus) (find_devices): I²C adapter: 0-0051 skipped: not a bus or unsupported adapter
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-2 (NVIDIA i2c adapter 2 at 1:00.0)
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-0 (SMBus I801 adapter at 0000:00:1f.4)
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-7 (NVIDIA i2c adapter 9 at 1:00.0)
[DEBUG] (smbus) (find_devices): I²C adapter: 0-0036 skipped: not a bus or unsupported adapter
[DEBUG] (smbus) (find_devices): I²C adapter: i2c-5 (NVIDIA i2c adapter 7 at 1:00.0)
[DEBUG] (usb) (find_devices): searching HidapiBus
[DEBUG] (usb) (find_devices): HidapiBus drivers: Aquacomputer, AsusRyujin, AsusRyuo, AuraLed, CommanderCore, CommanderPro, ControlHub, Coolit, CorsairHidPsu, H1V2, HydroPlatinum, Kraken2, KrakenX3, KrakenZ3, LianLiUni, MpgCooler, Nzxt2023RgbController, NzxtEPsu, RgbFusion2, SmartDevice, SmartDevice2, _BaseSmartDevice
[DEBUG] (usb) (find_devices): HID device: 1e71:1714 (usage_page=0xff00 usage=0x0001)
[DEBUG] (usb) (__init__): has kernel driver: nzxt-grid3 (/sys/class/hidraw/hidraw3/device/hwmon/hwmon3)
[DEBUG] (usb) (probe): SmartDevice identified: NZXT Smart Device (V1)
[DEBUG] (usb) (find_devices): HID device: 0951:1709 (usage_page=0x000c usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 0951:1709 (usage_page=0xff13 usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 25a7:fa19 (usage_page=0x0001 usage=0x0002)
[DEBUG] (usb) (find_devices): HID device: 25a7:fa19 (usage_page=0xff00 usage=0x000e)
[DEBUG] (usb) (find_devices): HID device: 25a7:fa19 (usage_page=0x0001 usage=0x0080)
[DEBUG] (usb) (find_devices): HID device: 25a7:fa19 (usage_page=0x000c usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 25a7:fa19 (usage_page=0x0001 usage=0x0006)
[DEBUG] (usb) (find_devices): HID device: 25a7:fa19 (usage_page=0x0001 usage=0x0006)
[DEBUG] (usb) (find_devices): HID device: 25a7:2301 (usage_page=0x0001 usage=0x0006)
[DEBUG] (usb) (find_devices): HID device: 25a7:2301 (usage_page=0x000c usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 25a7:2301 (usage_page=0x0001 usage=0x0080)
[DEBUG] (usb) (find_devices): HID device: 25a7:2301 (usage_page=0x0001 usage=0x0006)
[DEBUG] (usb) (find_devices): HID device: 25a7:2301 (usage_page=0x0001 usage=0x0002)
[DEBUG] (usb) (find_devices): HID device: 25a7:2301 (usage_page=0xffff usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 046d:c08e (usage_page=0x0001 usage=0x0002)
[DEBUG] (usb) (find_devices): HID device: 046d:c08e (usage_page=0x0001 usage=0x0006)
[DEBUG] (usb) (find_devices): HID device: 046d:c08e (usage_page=0x000c usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 046d:c08e (usage_page=0x0001 usage=0x0080)
[DEBUG] (usb) (find_devices): HID device: 046d:c08e (usage_page=0xff00 usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 046d:c08e (usage_page=0xff00 usage=0x0002)
[DEBUG] (usb) (find_devices): HID device: 046d:0a0e (usage_page=0x000c usage=0x0001)
[DEBUG] (usb) (find_devices): HID device: 1e71:170e (usage_page=0xff00 usage=0x0001)
[DEBUG] (usb) (__init__): has kernel driver: nzxt-kraken2 (/sys/class/hidraw/hidraw2/device/hwmon/hwmon2)
[DEBUG] (usb) (probe): Kraken2 identified: NZXT Kraken X (X42, X52, X62 or X72)
[DEBUG] (usb) (find_devices): searching PyUsbBus
[DEBUG] (usb) (find_devices): PyUsbBus drivers: Hydro690Lc, HydroPro, Legacy690Lc, Modern690Lc, _Base690Lc, _ModernBase690Lc
[DEBUG] (usb) (find_devices): USB device: 1d6b:0003
[DEBUG] (usb) (find_devices): USB device: 1d6b:0002
[DEBUG] (usb) (find_devices): USB device: 2109:0812
[DEBUG] (usb) (find_devices): USB device: 1d6b:0003
[DEBUG] (usb) (find_devices): USB device: 1e71:170e
[DEBUG] (usb) (find_devices): USB device: 046d:0a0e
[DEBUG] (usb) (find_devices): USB device: 05e3:0607
[DEBUG] (usb) (find_devices): USB device: 2109:2812
[DEBUG] (usb) (find_devices): USB device: 046d:c08e
[DEBUG] (usb) (find_devices): USB device: 25a7:2301
[DEBUG] (usb) (find_devices): USB device: 25a7:fa19
[DEBUG] (usb) (find_devices): USB device: 0951:1709
[DEBUG] (usb) (find_devices): USB device: 1e71:1714
[DEBUG] (usb) (find_devices): USB device: 1d6b:0002
Device #0: NZXT Smart Device (V1)
├── Vendor ID: 0x1e71
├── Product ID: 0x1714
├── Release number: 0x0200
├── Serial number: 497C47533332
├── Bus: hid
├── Address: /dev/hidraw3
└── Driver: SmartDevice
[DEBUG] (cli) (_list_devices_human): MRO: SmartDevice, _BaseSmartDevice, UsbHidDriver, BaseUsbDriver, BaseDriver, object

Device #1: NZXT Kraken X (X42, X52, X62 or X72)
├── Vendor ID: 0x1e71
├── Product ID: 0x170e
├── Release number: 0x0200
├── Serial number: 49874481333
├── Bus: hid
├── Address: /dev/hidraw2
└── Driver: Kraken2
[DEBUG] (cli) (_list_devices_human): MRO: Kraken2, UsbHidDriver, BaseUsbDriver, BaseDriver, object

liquidctl installation method

git

Operating system and version

Arch Linux with kernel Linux calvin 6.18.3-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 02 Jan 2026 17:52:55 +0000 x86_64 GNU/Linux