Dell Display Manager 2.0 command line documentation

DDM2.0.md

Dell Display Manager 2.0 Command Line

Decompiled DLL with ILSpy to identify various commands.

Most commands can be found in DDM2._0_UX.CmdBackground.cmdService_DoWork

Write commands can be prefixed with int:command to specify which monitor to send the command to.

.\DDM.exe /0:writebrightnesslevel 50

Read command output is only shown in the debug console.

Debugging Console

Used to show the output of various read commands

.\DDM.exe /console start

Commands

.\DDM.exe /console start Opens DDM Console

.\DDM.exe /readbrightnesslevel Reads the monitor brightness level

.\DDM.exe /writebrightnesslevel Sets the monitor brightness level

.\DDM.exe /readcontrastlevel Reads the monitor contrast level

.\DDM.exe /writecontrastlevel Sets the monitor contrast level

.\DDM.exe /readcapabilities Read monitor capabilities (in hex)

.\DDM.exe /readsupportedcontrols Read monitor supported controls (in hex)

.\DDM.exe /writecolorpreset Write color presets

.\DDM.exe /readcolorpreset Read color presets

.\DDM.exe /readorientation Read monitor orientation

.\DDM.exe /writeorientation Sets monitor orientation

.\DDM.exe /readmonitoractivehours Read monitor active hours

.\DDM.exe /writeactiveinput

.\DDM.exe /readactiveinput

.\DDM.exe /writepower

.\DDM.exe /writeosdlanguage

.\DDM.exe /osd

.\DDM.exe /readedid

.\DDM.exe /writeuc

.\DDM.exe /readmax

.\DDM.exe /readprivacy

.\DDM.exe /writeprivacy

.\DDM.exe /readfirmwareversion

.\DDM.exe /writevolume

.\DDM.exe /readvolume

.\DDM.exe /autocolorpreset

.\DDM.exe /swapvideo

.\DDM.exe /swapusb

.\DDM.exe /writesubinput

.\DDM.exe /writepxpmode

.\DDM.exe /writepxp

.\DDM.exe /readcontrol

.\DDM.exe /increasecontrol

.\DDM.exe /decreasecontrol

.\DDM.exe /writecontrol

.\DDM.exe /readpossible

.\DDM.exe /autosetup

.\DDM.exe /readmanufactureddate

.\DDM.exe /writemonitorpower

.\DDM.exe /readdisplaymode

.\DDM.exe /writeoptimalresolution

.\DDM.exe /readtiming

.\DDM.exe /readassetattributes

.\DDM.exe /log

.\DDM.exe /savediagnosticreport

.\DDM.exe /assetreport

.\DDM.exe /inventory

.\DDM.exe /surveyonly

.\DDM.exe /readdecodededid

.\DDM.exe /countmonitorsci

.\DDM.exe /monitornumber OR countmonitors

.\DDM.exe /usbpassthrough

.\DDM.exe /lockupdate

.\DDM.exe /noupdate

.\DDM.exe /screennotification

.\DDM.exe /lockrorate

.\DDM.exe /autostartup

.\DDM.exe /powernap

.\DDM.exe /colormanagement

.\DDM.exe /writeapplanguage

.\DDM.exe /telemetry

.\DDM.exe /writeealayout

.\DDM.exe /writeimportpermission

.\DDM.exe /displaymodel

.\DDM.exe /writeloglevel

.\DDM.exe /liveupdate") && ApplicationStartUp.Ota != null)

.\DDM.exe /rescan to refresh the connected devices -Thanks @rtxbae!

Some examples of using the utility on MacOS to enable picture by picture, thanks @sepl2604!

/Applications/DDPM/DDPM.app/Contents/MacOS/DDPM /writepxp pbp-2h-fill USB-C HDMI1 Activate 50-50 PBP

/Applications/DDPM/DDPM.app/Contents/MacOS/DDPM /writepxp off Turn off PBP

I got fed up with the slowness of DDPM and switched to using DDC directly which is much, much faster.

I took this repo: https://github.com/waydabber/m1ddc and made some modifications. This will be useful if you're using an M1 mac. It looks like it's been updated to support some of the functions I wanted but these addresses will be helpful if you wish to make your own fork:

#define LUMINANCE 0x10
#define CONTRAST 0x12
#define VOLUME 0x62
#define MUTE 0x8D
#define PBP 0xE9
#define SWAP_USB 0xE7
#define SWAP_INPUT 0xE5
#define INPUT 0x60
#define SUB_INPUT 0xE8
#define INPUT_ALT 0xF4 // alternate address, used for LG exclusively?
#define STANDBY 0xD6

Is it possible to change the display's number?

The display number is "wrong" in DDPM

In Mac OS (and also on Windows DPPM) is "correct"

For those who come across this gist looking for a way to disable automatic updates, the commands needed are:

.\ddm.exe /noupdate on to disable updates
.\ddm.exe /noupdate off to enable updates

Ben, thank you for this information.

Does anyone know / understand, why the command using vbs (see left in screenshot) does not work?
The same command using bat (see right in screenshot) works.

Thx!
Thomas