while exploring different possibilities of my monitor with different resolutions I have been using xrandr. I wish to know what one of the outputted data of xrandr means.
In the following example I would like to know what the final data set means (the part stating 890mm x 500mm)
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 890mm x 500mm
What are these Dimensions specifically, and are these parameters changeable?
In the line:
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 890mm x 500mm
indeed, the last section: 890mm x 500mm gives you the size of your screen x/y in mm
In this question, we ran into the same issue. The explanation is that by default, the screen is "assumed" to be at 96dpi, which is not necessarily the case. If the screen is on, the value is set form the "real" resolution (pixels/inch), which is obviously slightly different on your screen.
this bug is related to the issue; you would probably get the same difference when getting the screen info via xdpyinfo. Note that the xrandrsize with screen on is the correct size.
Obviously, you cannot change these values.
