Building

The following steps can be used to build gnome-monitor-config

$ meson build
$ cd build
$ meson compile

The output binary can be found in build/src/gnome-monitor-config.

Usage

For usage details, run

$ ./gnome-monitor-config --help

Usage: ./src/gnome-monitor-config [OPTIONS...] COMMAND [COMMAND OPTIONS...]
Options:
 -h, --help                  Print help text

Commands:
  list                       List current monitors and current configuration
  set                        Set new configuration
  show                       Show monitor labels

Options for 'set':
 -L, --logical-monitor       Add logical monitor
 -x, --x=X                   Set x position of newly added logical monitor
 -y, --y=Y                   Set y position of newly added logical monitor
 -s, --scale=SCALE           Set scale of newly added logical monitor
 -t, --transform=TRANSFORM   Set transform (normal, left, right, flip)
 -p, --primary               Mark the newly added logical monitor as primary
 -m, --mode                  Set the display resolution and refresh rate. ex: 1920x1080@60
 -M, --monitor=CONNECTOR     Add a monitor (given its connector) to newly added
                             logical monitor
 -p, --primary               Mark the newly added logical monitor as primary
 --logical-layout-mode       Set logical layout mode
 --physical-layout-mode      Set physical layout mode

Single-Monitor configuration

Start with gnome-monitor-config list to get a list of available monitors and configurations.

$ gnome-monitor-config list
...
  [email protected] [id: '[email protected]'] [preferred scale = 1 (1)]
  720x576@50 [id: '[email protected]'] [preferred scale = 1 (1)]
Logical monitor [ 2560x1440+0+0 ], scale = 1, transform = left
  DP-3
Logical monitor [ 3840x1600+1440+270 ], PRIMARY, scale = 1, transform = normal
  DP-1
Max screen size: unlimited

For example to set a single display to a particular configuration:

$ gnome-monitor-config set -LpM DP-1 -t normal -m [email protected]

This sets the display attached to DP-1 as the primary display (specified with -p) at [email protected] configuration with a normal orientation.

Multi-Monitor config

Similarly, to setup multple monitors. First use the list command to get a list of what is available, then simply:

$ gnome-monitor-config set -LM DP-3 -m [email protected] -t left -LpM DP-1 -m [email protected]" -x 1440 -y 270 -t normal 

This command sets the monitor attached to DP-3 at the starting point [0, 0], configured at [email protected] and left transformed (portrait). Then the next monitor on DP-1 is configured as the primary (-p) with an x,y offset of [1440, 270] relative to the first one with normal orientation. For getting the correct y offset with multiple monitors, you can simple experiment with the value to get an appropriate alignment.