Game Widescreener detects your monitor's resolution and has the value pre-loaded in the 'Screen resolution' section. I tested by this by disconnecting my 1080p monitor and it picked up my laptop's resolution (1366 x 768).

ChangeScreenResolution.exe allows you to the following things from your Windows command line:

change specific aspects of one / more / all display:
- width and / or height (screen resolution>
- frequency
- bits per pixel (color depth)
query the supported screen modes (resolution, color depth, frequency, output mode)

Quick examples

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Change screen resolution of all monitors to 800x600px
ChangeScreenResolution.exe /w=800 /h=600

Change screen resolution of monitors with index 0 to 800x600px
ChangeScreenResolution.exe /w=800 /h=600 /d=0

Change screen resolution of all monitors to 800x600px with refresh rate of 60Hz and 32bit color depth
ChangeScreenResolution.exe /w=800 /h=600 /f=60 /b=32

Set color depth of display with index 1 to 16bit
ChangeScreenResolution.exe /b=16 /d=1

List all available modes of displays with index 1,3,5
ChangeScreenResolution.exe /m /d=1,3,5

List all available displays
ChangeScreenResolution.exe /l

Download

Feel free to download and use the executable:

Last update 2017-01-03

If you found this tool useful, please consider a donation:

Please note, that you might need to install the Redistributable Packages for Visual Studio 2013 first, especially if you are on Windows 10. - Thanks to Nate

Usage

This tool allows you get information about your display adapters and set options for them.

Option overview

Group	Parameter	Description	Example
get	`/l`	List all display devices
get	`/m`	List all available modes
set	`/w=<width>`	Set the width in pixel	`/w=1024`
	`/h=<height>`	Set the height in pixel	`/h=768`
	`/f=<frequency>`	Set the image refresh rate	`/f=50`
	`/b=<bpp>`	Set the bits per pixel (color depth)	`/b=16`
filter	`/d=<device>`	Set/query only specified device (name or index)	`/d=0` or `/d=.DISPLAY1`
other	`/log=<logfile>`	Write the program output to a logfile	`/log=C:log.txt`
	`/force`	Apply the registry update if at least one update was successful
	`/alternatives`	Show alternatives on adapter 0 if setting a resolution fails

Getting information

/l List display devices

ChangeScreenResolution.exe /l

The command lists all graphic cards with the connected monitors in the format:

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[<INDEX>] <DISPLAY_NAME> <DISPLAY_STRING> <MONITOR_NAME> <MONITOR_STRING>

Variables:

Variable	Description
`<INDEX>`	The index of the graphic card, use eg for filter parameter /d
`<DISPLAY_NAME>`	Identifier string of the display (graphic card), use eg for filter parameter /d
`<DISPLAY_STRING>`	Description (model / brand) of the graphic card
`<MONITOR_NAME>`	Identifier string of the monitor
`<MONITOR_STRING>`	Description (model / brand) of the monitor

Example output:

Connected display devices: [0] .DISPLAY1 Intel(R) HD Graphics 4600 .DISPLAY1Monitor0 PnP-Monitor (Standard) [1] .DISPLAY2 Intel(R) HD Graphics 4600 .DISPLAY2Monitor0 PnP-Monitor (Standard) [2] .DISPLAY3 Intel(R) HD Graphics 4600 [3] .DISPLAYV1 RDPDD Chained DD [4] .DISPLAYV2 RDP Encoder Mirror Driver [5] .DISPLAYV3 RDP Reflector Display Driver

/m List modes

ChangeScreenResolution.exe /m

List only available modes for device with index 0:
ChangeScreenResolution.exe /m /d=0

The command lists all graphic cards with the connected monitors in the format:

Display modes for <DISPLAY_NAME>: <width>x<height> <bpp>bit @<frequency>Hz <fixed output> <width>x<height> <bpp>bit @<frequency>Hz <fixed output> [..] Display modes for <DISPLAY_NAME>: <width>x<height> <bpp>bit @<frequency>Hz <fixed output> [..]

Variables:

Variable	Description
`<DISPLAY_NAME>`	Identifier string of the display (graphic card)
`<width>`	width in px of the mode
`<height>`	height in px of the mode
`<bpp>`	bits per pixel (color depth) of the mode
`<frequency>`	frequency in Hz of the mode
`<fixed output>`	fixed output mode (stretched, centered, default)

Example output:

Display modes for .DISPLAY1: 320x200 8bit @59Hz centered 320x200 8bit @59Hz stretched 320x200 8bit @60Hz centered 320x200 8bit @60Hz stretched 320x200 16bit @59Hz centered 320x200 16bit @59Hz stretched 320x200 16bit @60Hz centered 320x200 16bit @60Hz stretched 320x200 32bit @59Hz centered 320x200 32bit @59Hz stretched 320x200 32bit @60Hz centered 320x200 32bit @60Hz stretched 320x240 8bit @59Hz centered 320x240 8bit @59Hz stretched 320x240 8bit @59Hz default [..] 1600x900 32bit @59Hz default 1600x900 32bit @60Hz centered 1600x900 32bit @60Hz stretched 1600x900 32bit @60Hz default 1680x1050 8bit @59Hz default 1680x1050 8bit @60Hz default 1680x1050 16bit @59Hz default 1680x1050 16bit @60Hz default 1680x1050 32bit @59Hz default 1680x1050 32bit @60Hz default Display modes for .DISPLAY2: [..]

Setting display options

The software sets the new display options in two steps

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Update the options in the registry for every requested monitor
Apply the registry updates

If the registry update fails, the software aborts and does not try to apply the changes (except with /force parameter.

Basic output

If you use a set parameter, the program outputs first the retrieved settings so you can see which changes it tries to set.

Example output:

c:>ChangeScreenResolution.exe /b=24 /w=1024 Setting devices: - .DISPLAY1 - .DISPLAY2 - .DISPLAY3 to the following parameters: - width = 1024 - color depth = 24 [..]

Return messages

Each of these steps can produce it's own status messages

The settings change was successful. (DISP_CHANGE_SUCCESSFUL)
The settings change was unsuccessful because the system is DualView capable. (DISP_CHANGE_BADDUALVIEW)
An invalid set of flags was passed in. (DISP_CHANGE_BADFLAGS)
The graphics mode is not supported. (DISP_CHANGE_BADMODE)
An invalid parameter was passed in. This can include an invalid flag or combination of flags. (DISP_CHANGE_BADPARAM)
The display driver failed the specified graphics mode. (DISP_CHANGE_FAILED)
Unable to write settings to the registry. (DISP_CHANGE_NOTUPDATED)
The computer must be restarted for the graphics mode to work. (DISP_CHANGE_RESTART)

Example: Failed to set display with index 0 to a width of 800px (because the current resolutions height has no matching width with 800px, eg current resolution is 1024x768px)
c:>ChangeScr