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I am using HP G62 laptop and it has intel HD graphics. Screen resolution in ubuntu OS is fixed at 1024 x 768. Plz tell me how to change the screen resolution. Apparently there is no option once I goes to system settings/ display

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You can use xrandr -q to see what resolutions are available for your display

From the manpage

Xrandr is used to set the size, orientation and/or reflection of the outputs for a screen. It can also set the screen size.

To change the screen resolution to 1024 by 768, you would type:

xrandr -s 1024x768

Just use that to change it to the size you want.

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Click Here

 $ xrandr --output VGA1 --mode 1024x768 --rate 60
  $ xrandr --output LVDS --mode 1024x768 --rate 75
  $ xrandr --output LVDS --mode 1024x768 --rate 75
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