$ 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?
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As Muru mentions, the
1366 is the horizontal offset of your screen.
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
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
+1680+0 shows similar information, as you can see in the image
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:
More on the options of xrandr here.