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I have an Ubuntu Live USB and I was looking for xorg.conf so I could insert an Option "InvX" "on" within it (I am not quite sure how that works exactly yet). xorg.conf does not exist in its normal place on the live usb/cd. Where can I easily and permanently make this change?

Background: I am running ubuntu on a kiosk machine where mouse movement works like a touch screen (sort of).

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I've tried to address the issue of how to invert the mouse axis, but I don't exactly understand what you mean by "like a touch screen (sort of)". Please elaborate and I will try to make my answer more relevant to the question. –  Stefano Palazzo Dec 6 '10 at 23:57
    
Its not exactly a touch screen, they kinda faked it with some sort of laser thing close to the screen. In any case, your solution worked just fine! Thanks! –  Parris Dec 7 '10 at 0:25
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1 Answer

up vote 4 down vote accepted

xorg.conf is, for all intents and purposes, no longer there. But there is now a directory, /usr/share/X11/xorg.conf.d/, that keeps configuration options for x.org.

A side note: In 10.04 Lucid, the directory is /usr/lib/X11/xorg.conf.d/.

To invert the mouse movement:

  • Create a file /usr/share/X11/xorg.conf.d/50-invertaxes.conf

    • to create this file, you need to gain root privileges. Start your favourite text-editor like this: gksu gedit. This will prompt you for a password.

    • alternatively, you can type this into a Terminal:

      sudo nano /usr/share/X11/xorg.conf.d/50-invertaxes.conf
      
  • Put the following into the file:

    Section "InputClass"
        Identifier  "Invert Mouse"
        MatchProduct    "The name our your mouse in xorg"
        MatchDevicePath "/dev/input/event*"
        Option      "InvertY"       "true"
        Option      "InvertX"       "true"
    EndSection
    

    Where you replace "the name of your mouse in xorg" with the real name as detected by xorg.

  • to find out what Identifer you need to use, open a terminal and type

    xinput list
    

    this will produce output similar to this:

    ⎡ Virtual core pointer                      id=2    [master pointer  (3)]
    ⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
    ⎜   ↳ Logitech USB Receiver                     id=10   [slave  pointer  (2)]
    ⎜   ↳ Logitech USB Receiver                     id=11   [slave  pointer  (2)]
    ⎜   ↳ SynPS/2 Synaptics TouchPad                id=14   [slave  pointer  (2)]
    [more...]
    

    From there I can see the Identifier of my Logitech mouse, Logitech USB Reciever.

To be able to keep this configuration, you will have to have set up your Live USB drive with "Persistent storage":

old screenshot of usb startup disk creator

Enable the option at the bottom, "Stored in reserved extra space", before creating your new USB startup disk and your settings will be kept when rebooting.

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By the way, after I created 50-invertedaxes.conf I simply restarted and it worked just fine. No other configuration was needed to make it persistent. I should note that I used the Linux Live USB generator as instructed by ubuntu.com with the netbook remix iso. –  Parris Dec 7 '10 at 0:30
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