Rotate Screen in Ubuntu

The screen rotation function in Nvidia graphics driver is normally disabled. But We can enable it by modifying xorg.conf file.

To do this, we need to back up xorg.conf file first.

$ sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.bak

Now edit the file:
$ sudo gedit /etc/X11/xorg.conf

In the Device section that includes the line:

         Driver    "nvidia"

         Option "RandRRotation"   "on"

It will looks like:

Section "Device"
    Identifier            "Device0"
    Driver                "nvidia"
    VendorName     "NVIDIA Corporation"
    Option                "RandRRotation" "on"

Then, we need to log out and log back in to restart X server.

To rotate screen to left, use:
$ xrandr -o left

To rotate screen to right, use:
$ xrandr -o right

To flip screen upside down, use:
$ xrandr -o inverted

To go back to normal, use:
$ xrandr -o normal

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