What Default Window Manager Is Used in LXDE?

The Lightweight X11 Desktop Environment (LXDE) relies on Openbox as its standard default window manager. Built specifically for energy efficiency and low resource consumption, LXDE pairs Openbox with a collection of independent desktop components to provide a responsive graphical user interface on older or low-spec hardware. This article explores why Openbox was chosen, how it integrates into the LXDE ecosystem, and the key benefits of this pairing.

The Role of Openbox in LXDE

Openbox is a highly configurable, standards-compliant window manager known for its minimalistic footprint. Rather than providing an entire desktop suite itself, Openbox focuses strictly on managing client windows: decorating frames, managing workspaces, and handling window placement, movement, and resizing.

In a standard LXDE installation, Openbox operates underneath the LXDE session manager (lxsession). While other desktop environments bundle tightly integrated window managers—such as GNOME with Mutter or Xfce with Xfwm—LXDE intentionally chose an existing, mature standalone tool to keep development modular and system overhead exceptionally low.

How Openbox Integrates with LXDE Components

LXDE follows the Unix philosophy of doing one thing well. Because Openbox handles only window behavior, other independent modular tools fill in the traditional desktop features:

• PCManFM: Serves as the default file manager while also drawing the desktop background and managing desktop icons.
• LXPanel: Provides the taskbar, system tray, application launch menu, and clock.
• LXAppearance: Offers a graphical interface to customize GTK themes, icon packs, and mouse cursors.
• ObConf: A dedicated configuration tool specifically for Openbox, allowing users to alter window borders, titlebar button placement, focus behavior, and virtual desktop counts.

When an LXDE session boots, lxsession launches Openbox alongside LXPanel and PCManFM, creating a cohesive, conventional desktop interface out of individual utilities.

Advantages of the Openbox and LXDE Pairing

The primary advantage of bundling Openbox with LXDE is performance. Openbox consumes minimal RAM—often just a few megabytes—and uses virtually no idle CPU cycles. This makes the combination ideal for legacy computers, single-board computers like the Raspberry Pi (which historically based its Raspberry Pi OS desktop, PIXEL, on LXDE), and virtual machines with constrained resource allocations.

Additionally, Openbox provides extensive keyboard shortcut configurability via simple XML configuration files located in the user's home directory. Power users can navigate, tile, and manipulate windows entirely through custom keybindings without needing heavy desktop services running in the background.