Compton在Debian上的多显示器设置

Installing Compton on Debian
Before configuring multi-monitor support, ensure Compton is installed on your Debian system. Run the following commands to update your package list and install Compton:

sudo apt-get update
sudo apt-get install compton

This installs the latest version of Compton available in Debian’s repositories.

Configuring Multi-Monitor Support in Compton
Compton relies on your display layout (configured via xrandr) to manage multiple monitors. Follow these steps to set up multi-monitor support:

1. Verify Display Configuration with xrandr
   Run xrandr --query to list all connected displays and their current arrangement (e.g., HDMI-1, DP-1, eDP-1). Note the names of your displays and their connections (e.g., “right-of” or “left-of”). For example:

   HDMI-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 510mm x 287mm
   DP-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   eDP-1 connected primary 1920x1080+3840+0 (normal left inverted right x axis y axis) 344mm x 194mm
   

   This shows three displays: eDP-1 (laptop screen, primary), HDMI-1 (right of eDP-1), and DP-1 (right of HDMI-1).

2. Set Up Displays with xrandr
   Use xrandr commands to arrange your displays. For example, to extend HDMI-1 and DP-1 to the right of eDP-1, run:

   xrandr --output HDMI-1 --auto --right-of eDP-1
   xrandr --output DP-1 --auto --right-of HDMI-1
   

   Replace the display names and positions with your desired layout. This step ensures your displays are correctly configured before Compton starts.

3. Edit the Compton Configuration File
   Compton’s main configuration file is typically located at ~/.config/compton.conf (create it if it doesn’t exist). Open the file with a text editor (e.g., nano):

   mkdir -p ~/.config
   nano ~/.config/compton.conf
   

   Add or modify the following options to support multi-monitor setups:

   • Specify the Backend: Use glx for hardware acceleration (recommended for better performance with multiple monitors):

     backend = "glx";
     

   • Enable Xinerama Support: If you’re using X11, ensure disable-xinerama is set to false (this allows Compton to recognize multiple displays):

     disable-xinerama = false;
     

   • Configure Per-Monitor Rules (Optional): If you want to apply specific settings to certain monitors (e.g., disable shadows on an external display), use the xrandr-output directive. For example, to apply settings to HDMI-1 and DP-1 (linked to eDP-1), add:

     xrandr-output "HDMI-1" "eDP-1";
     xrandr-output "DP-1" "HDMI-1";
     

     This tells Compton to treat HDMI-1 as an extension of eDP-1 and DP-1 as an extension of HDMI-1.

4. Start Compton with the New Configuration
   After saving the configuration file, start Compton with the -c flag to specify the config path:

   compton -c ~/.config/compton.conf
   

   If Compton is already running, kill the existing process first:

   killall compton
   compton -c ~/.config/compton.conf
   

Setting Up Compton to Start at Boot
To ensure Compton launches automatically after a reboot, create a systemd service:

1. Create a new service file:

   sudo nano /etc/systemd/system/compton.service
   

2. Add the following content (replace ~/.config/compton.conf with your actual config path if different):

   [Unit]
   Description=Compton Window Composer
   After=display-manager.service
   
   [Service]
   ExecStart=/usr/bin/compton -c ~/.config/compton.conf
   Restart=on-failure
   
   [Install]
   WantedBy=multi-user.target
   

3. Enable and start the service:

   sudo systemctl daemon-reload
   sudo systemctl enable compton.service
   sudo systemctl start compton.service
   

   Verify the service status with systemctl status compton.service—it should show as “active (running)”.

Troubleshooting Common Issues

• Displays Not Recognized: Ensure xrandr is configured correctly before starting Compton. Run xrandr --query to verify your display layout.
• Performance Issues: If Compton slows down with multiple monitors, try disabling shadows (shadow = false;) or using a lighter backend (e.g., xrender instead of glx).
• Configuration Errors: Check the Compton log for errors (run compton -c ~/.config/compton.conf --log-level debug) and adjust the config file accordingly.

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