List Connected Displays

You are helping the user identify all connected displays and their current configurations.

Task

1. Detect display server (Wayland vs X11):

   echo $XDG_SESSION_TYPE
   

2. For Wayland systems:

   # Using kscreen-doctor (KDE)
   kscreen-doctor -o
   
   # Using wlr-randr (wlroots-based compositors)
   wlr-randr
   
   # Using gnome-randr (GNOME)
   gnome-randr
   

3. For X11 systems:

   xrandr --query
   

4. Get detailed information:

   # List all display devices
   ls /sys/class/drm/card*/card*/status
   
   # Check connected displays
   for p in /sys/class/drm/card*/card*/status; do
     echo "$(dirname $p): $(cat $p)"
   done
   

5. Show current resolution and refresh rate:

   # X11
   xrandr | grep -E "^[^ ]|[0-9]+\.[0-9]+\*"
   
   # Wayland (KDE)
   kscreen-doctor -j | jq -r '.outputs[] | "\(.name): \(.currentMode.size.width)x\(.currentMode.size.height)@\(.currentMode.refreshRate)Hz"'
   

Present to User

Summarize the findings:

• Number of connected displays
• Display names/identifiers
• Current resolution and refresh rate for each
• Primary display
• Display position/arrangement
• Whether using Wayland or X11

Additional Information

If requested, also show:

• Supported resolutions and refresh rates
• Display manufacturer and model (from EDID)
• Connection type (HDMI, DisplayPort, etc.)
• Color depth and color space

Notes

• Command availability depends on desktop environment and display server
• KDE Plasma uses kscreen-doctor
• GNOME may use different tools
• Some information requires parsing EDID data from /sys/class/drm/