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This video breaks down how input actually works on Linux—from the moment you press a key or move a mouse, all the way to what your desktop environment receives. We walk through the entire input stack end-to-end and explain each layer in a clear, structured way.

You’ll learn:

• How hardware devices (keyboards, mice, touchpads, controllers) communicate through buses like USB, Bluetooth, and PS/2
• How the Linux kernel’s Input Core processes events using drivers, input_dev, and the event fan-out system
• How evdev exposes standardized /dev/input/eventX interfaces to user-space
• How devtmpfs, sysfs, and procfs provide device nodes, metadata, and introspection
• How udev + hwdb identify, configure, and manage input devices
• How higher-level libraries like libinput and XKB interpret raw events
• How Wayland compositors, X11, and toolkits consume and act on those events

If you’ve ever wondered how a keypress travels through the kernel, through libraries, and finally into your window manager or application, this overview ties the entire pipeline together. A great reference for system developers, kernel enthusiasts, and anyone curious about Linux internals.