Here's a bash script to do it automatically
```
#!/bin/bash
# Usage: ./change_resolution.sh <width> <height> <refresh_rate>
# Example: ./change_resolution.sh 1800 1169 120
# Check if three arguments are provided
if [ "$#" -ne 3 ]; then
echo "Usage: $0 <width> <height> <refresh_rate>"
exit 1
fi
# Assign input parameters
width="$1"
height="$2"
refresh="$3"
# Run cvt to generate modeline information
cvt_output=$(cvt "$width" "$height" "$refresh")
# Extract the line containing "Modeline"
modeline_full=$(echo "$cvt_output" | grep "Modeline")
# Remove the word "Modeline" to get only the parameters
modeline=$(echo "$modeline_full" | sed 's/Modeline //')
# Extract the mode name (first token, removing quotes)
mode_name=$(echo "$modeline" | awk '{print $1}' | sed 's/"//g')
# Get the remaining parameters (everything after the mode name)
mode_params=$(echo "$modeline" | cut -d' ' -f2-)
# Create the new mode with xrandr using the mode name and parameters
xrandr --newmode "$mode_name" $mode_params
# Add the new mode to the output "Virtual-1"
xrandr --addmode Virtual-1 "$mode_name"
# Set the new mode on "Virtual-1"
xrandr --output Virtual-1 --mode "$mode_name"
```
