winddcutil

An partial implementation of https://github.com/rockowitz/ddcutil for Windows. Winddcutil can communicate with attached monitors using Display Data Channel/Command Interface (DDC/CI) to query and change monitor state, f.e. to control which input source is displayed.

Features

• List attached displays
• Query display capabilitites string
• Set VCP feature values

Usage

winddcutil <command>

Where command is one of:

detect
capabilities <display ID>
setvcp <display ID> <feature-code> <new-value>

Example

List available displays:

C:\>winddcutil detect
Display 0
         Name: Dell P2416D(HDMI)
Display 1
         Name: Generic PnP Monitor

Show capabilities of display 0:

C:\>winddcutil capabilities 0
(prot(monitor)type(LCD)model(P2416D)cmds(01 02 03 07 0C E3 F3)
vcp(02 04 05 08 10 12 14(05 08 0B 0C) 16 18 1A 52 60(01 11 0F)
AA(01 02) AC AE B2 B6 C6 C8 C9 D6(01 04 05) DC(00 02 03 05) DF
E0 E1 E2(00 01 02 04 0E 12 14 19) F0(00 08) F1(01 02) F2 FD)
mswhql(1)asset_eep(40)mccs_ver(2.1))

Set VCP feature 96 (0x60) to value 15 (0x0F):

C:\>winddcutil setvcp 0 96 15

Feature 0x60 is the selected input source. Setting it to 0x0F selects the first display port, at least for this monitor. Available input sources are shown above in bold.

TODO

(in no particular order)

• Parse capabilities string, to create output similar to the original ddcutil.
• Accept numeric parameters in hexadecimal.
• Implement more features, such as querying current VCP feature values.