$ xrandr
VGA1 connected 1024x768+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm

I don't understand what the number 1366 in 1024x768+1366+0 represents. Can I change its value?

  • 1
    Are you using a dual-monitor setup? 1366 is horizontal offset of that display.
    – muru
    Apr 26 '15 at 5:56
  • Yes, i'm using a dual-monitor setup. Thank you
    – Helio
    Apr 26 '15 at 15:28

As Muru mentions, the 1366 is the horizontal offset of your screen.

How to read the output of xrandr

An example:

enter image description here

Imagine your two screens, placed together into a frame. Together, they will make a virtual screen as you can see above. In the output of xrandr, the left screen shows: 1680x1050+0+347. The last two figures; +0+347 show the x and y distance (px) of the upper left corner of the screen, to the upper left corner of the virtual frame they are in.

The right screen shows 1280x1024+1680+0. The +1680+0 shows similar information, as you can see in the image

Can You change these values?

Within boundaries, yes. An example to make both screens top-alligned:

xrandr --output DVI-I-1 --pos 0x0

Where DVI-I-1 is my left screen

This will create the situation as below:

enter image description here

More on the options of xrandr here.

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