DisplayPort

Tech 15 Sep 2026 6 min read

EDID Advertises Display Modes to Video Sources

A computer does not usually guess a monitor’s native resolution from the image it sees. The display exposes a small block of capability data called Extended Display Identification Data, or EDID. A video source reads that data and uses it as one input when building the list of resolutions, refresh rates, color formats, and related options offered to the operating system. EDID is descriptive rather than a guarantee that every advertised combination will work through every connection. The source, cable, adapter, dock, receiver, link bandwidth, graphics driver, and display input can impose additional limits.

Tech Displays

Tech 14 Sep 2026 6 min read

USB-C DisplayPort Alt Mode and Video Output

Two laptops can have USB-C ports that look identical while only one can drive a monitor through a simple USB-C-to-DisplayPort cable. The connector shape does not guarantee the signals available behind it. USB-C defines a reversible connector and a system for negotiating several capabilities. DisplayPort Alt Mode is one method that lets compatible equipment use high-speed USB-C lanes for DisplayPort signaling. Video output therefore depends on more than the presence of the port itself.

USB-C DisplayPort

Tech 08 Sep 2026 7 min read

Why a Monitor Can Say No Signal Even When the Cable Is Connected

A monitor can be powered on, connected by a cable, and still show No Signal. The message is easy to misread: it usually does not mean that the monitor itself has no power, and it does not prove that the cable is broken. It means the monitor is not receiving a usable video signal on the input it is currently trying to display. The quickest way to troubleshoot it is to trace that path from the source device to the selected monitor input. Each check tells you which link is still working.

Displays Monitors