# LightDM

**LightDM** is a lightweight, cross-desktop display manager used to handle graphical logins on Linux systems. It provides the login screen (called a greeter) and manages user sessions, including authentication and session launching.

**🧭 Key Features of LightDM:**

- Lightweight and fast: Designed to use minimal system resources compared to heavier alternatives like GDM (GNOME Display Manager).
- Cross-desktop compatibility: Works with GNOME, KDE, Xfce, LXDE, and other desktop environments.
- Greeter flexibility: Supports multiple greeter front-ends, such as:
  - LightDM GTK Greeter (default for many distros)
  - Slick Greeter (used by Linux Mint)
  - Webkit Greeter (HTML/CSS-based)
- Remote login support: Includes protocols like XDMCP and VNC for remote graphical sessions.
- Guest sessions and autologin: Can be configured for temporary guest accounts or automatic login.

**Install:**

``` bash
apt install lightdm
```

**Disable suspend black screen:**

```bash
# /etc/lightdm/lightdm.conf
[Seat:*]
xserver-command=X -s 0 dpms
```

**Lightdm auto login:**

```bash
# /etc/lightdm/lightdm.conf
[SeatDefaults]
autologin-user=$USERNAME_TO_AUTOLOGIN
autologin-user-timeout=5
# Uncomment the following, if running Unity
#greeter-session=unity-greeter
```