I was trying to modify the screen resolution using xrandr. I used the following command.
xrandr -s 1680x1050
It returned an error.
size 1680x1050 not found in available modes
I figured I have to define and add the mode.
cvt 1680 1050
worked. After that I tried to add new mode
xrandr --newmode <model-line>
Here the newmode option is not recognized. The command does not go through.
usage: xrandr [options] where options are -display -help. etc.
And the --newmode option is not even listed there.