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.
Used to show the output of various read commands
.\DDM.exe /console start
.\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