Extended display identification data (EDID) is a block of information sent by a computer monitor to the computer to inform it of its capabilities. This enables the computer to recognise the monitor and use the correct driver automatically and ensure that you can only select display resolutions which the monitor can handle. When diagnosing display problems, it can help to see the EDID sent by the monitor to see the display modes and timings the monitor can work with. In Ubuntu Linux, you can dump the EDID information using the read-edid package.
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Log in to the computer through secure shell (SSH) if you are using Ubuntu Server or click "Applications" and then select "Accessories" and "Terminal" if you are using Ubuntu Desktop, to open a new terminal session.
Type "sudo apt-get install read-edid" at the terminal prompt to install the necessary tools to display the EDID settings from your monitor. Type your password when prompted by the sudo command, to enable apt-get to run as root for the install.
Type "sudo /usr/sbin/read-edid | /usr/bin/parse-edid" to run the read-edid utility, then pipe the results to the parse-edid utility for analysis. The EDID data sent by the monitor is displayed on the screen.
Type "Exit" to close the terminal session.
Tips and warnings
- Add " > filename.txt" to the end of the commands to save the EDID data to a file named "filename.txt."
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