[Feature Request] LCD screen support for ASUS Ryujin III White (0b05:1ada / OLED Controller 0b05:1936)

Start with the existing asus_ryujin driver and its set_screen stub, then compare how Ryujin II 360 LCD support is implemented. Capture and inspect USB HID traffic for the separate OLED Controller (0b05:1936) to determine the protocol. Done means liquidctl lists the controller and supports static images, GIFs, and brightness for the LCD.

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

Is this a support request?

• This is not a support request

Description

Device Information

Field	Value
Device	ASUS Ryujin III White
Cooler USB ID	0b05:1ada
OLED Controller USB ID	0b05:1936
Firmware	AURJ2-S750-0108
liquidctl version	1.16.0
OS	Ubuntu 24.04, kernel 6.8.0-49-generic

lsusb Output

Bus 001 Device 004: ID 0b05:1a98 ASUSTek Computer, Inc. USB Audio
Bus 001 Device 014: ID 0b05:1936 ASUSTek Computer, Inc. OLED Controller
Bus 001 Device 010: ID 0b05:18f3 ASUSTek Computer, Inc. AURA LED Controller
Bus 001 Device 011: ID 0b05:1ada ASUSTek Computer, Inc. ROG RYUJIN III WHITE EDITION

Current Behavior

The cooler is detected and initialized successfully:

$ sudo liquidctl --match ryujin initialize
ASUS Ryujin III White
└── Firmware version    AURJ2-S750-0108

However, attempting to control the LCD screen fails:

$ sudo liquidctl --match ryujin set lcd screen static /path/to/image.jpg
ERROR: ASUS Ryujin III White: operation not supported by the driver

Inspecting the source confirms set_screen is a stub:

def set_screen(self, channel, mode, value, **kwargs):
    # Not yet reverse engineered / implemented
    raise NotSupportedByDriver()

Expected Behavior

LCD screen control (static image, GIF, brightness) via liquidctl, similar to what
is supported for the Ryujin II 360.

Notes

• The LCD is exposed as a separate USB device (0b05:1936, labeled "OLED Controller"),
  distinct from the main cooler device (0b05:1ada).
• Pump speed, fan control, and temperature sensors all work correctly via the existing driver.
• The OLED Controller does not currently appear in liquidctl list at all — it may
  need its own driver entry or to be handled within the existing asus_ryujin driver.
• Happy to assist with USB HID traffic capture (usbmon + Wireshark via Windows VM)
  if that would help reverse engineer the protocol. Please let me know what data
  would be most useful.

Related

• #829 — Ryujin III EXTREME support (merged into 1.16.0)
• #866 — Ryujin III White support (merged into 1.16.0, fan/pump only)