How to change Screen Resolution in Linux using Xrandr

xrandr is an official configuration utility to the RandR X Window System extension. It can be used to set the size, orientation or reflection of the outputs for a screen. For configuring multiple monitors see the Multihead page. 

? Instructions :

� First you need to enter the following command

$ xrandr

this will display the allowed resolutions

� Then set the resolution you want to use

$ xrandr -s  your desired resolution

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