documentation/manual/source/dualmonitors.rst

Dual Monitor Setup

The first step in getting OpenLP working on your system is to setup your computer properly for dual monitors. This is not very difficult, but the steps will vary depending on operating system.

Most modern computers have the ability for dual monitors. To be certain, check your computer's documentation. A typical desktop computer capable of dual monitors will have two of, or a combination of the two, connectors below.

VGA

DVI

A laptop computer setup only varies slightly. Generally you will need only one of the outputs pictured above since your laptop screen serves as one of the monitors. Sometimes with older laptops a key stroke generally involving the Fn key and another key is required to enable the second monitor on laptops.

Some computers also incorporate the use of S-Video (Separate Video) or HDMI (High-Definition Multimedia Interface) connections.

A typical OpenLP setup consist of your normal single monitor, with your projector hooked up to your computer as the second monitor. With the option of extending your desktop across the second monitor, or your operating system's equivalent.

Special Note For Projectors Using USB Connections

Users have reported experiencing difficulties when using a projector with a USB connection, as third party software is often required to properly configure dual monitors. If possible, it is best to use a direct output (VGA, DVI, HDMI, S-Video) from your machine's video card. If a USB connection is your only option please consult the manufacturer's manual for instructions on a proper setup.

Microsoft Windows

Dual monitor setup is similar among all the currently supported Windows releases (XP, Vista, Windows 7), but does vary slightly from one release to the next.

Windows 7

Windows 7 has using a projector in mind. Simply connect your projector and press Windows+P.

The more traditional way is also fairly straight forward. Go to Control Panel and click on Display. This will open up the Display dialog. You may also bypass this step by a right click on a blank area on your desktop and selecting Resolution.

Then click on the Adjust resolution link in the left pane. Enable your projector and make sure that the selected value for Multiple displays is Extend these displays.

Windows Vista

From Control Panel click on Personalize, or right click a blank place on the desktop and click Personalization.

From the Personalization window click on Display Settings. Click on the monitor that represents your projector and make sure you have checked Extend the desktop onto this monitor.

Windows XP

From Control Panel select Display, or right click on a blank area of the desktop and select Properties. From the Display Properties window click on the Settings tab. Click on the monitor that represents your projector and make sure you have checked Extend my Windows desktop onto this monitor.

Linux

Due to the vast varieties of hardware, distributions, desktops, and drivers this is not an exhaustive guide to dual monitor setup on Linux. This guide assumes you have properly set up any proprietary drivers if needed. You should seek out your distributions documentation if this general guide does not work.

GNOME

This guide is for users of the GNOME desktop who do not use proprietary drivers. From most distros go to System --> Preferences --> Display Settings (Monitors). Set up your projector with the correct resolution and make sure that Same image on all monitors is unchecked.

KDE

This guide is for users of the KDE desktop who do not use proprietary drivers. From most distros click the Kick Off menu and navigate to System Settings

Click on the display and monitor icon.

From here you will need to set up your projector with the appropriate resolution, and position. OpenLP works best projecting to the monitor on the right.

Linux Systems Using nVidia Drivers

This guide is for users of the proprietary nVidia driver on Linux Distributions. It is assumed that you have properly setup your drivers according to your distribution's documentation, and you have a working xorg.conf file in place.

If you wish to make the changes permanent in setting up your system for dual monitors it will be necessary to modify your xorg.conf file. It is always a good idea to make a backup of any critical file before making changes:

user@linux:~ $ sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.old

Or for those using systems that use the root user instead of sudo, change to root and enter:

root@linux: # cp /etc/X11/xorg.conf /etc/X11/xorg.conf.old

The exact location of the xorg.conf file can vary so check your distribution's documentation.

If you want to make your changes permanent run nVidia settings from the terminal:

user@linux:~ $ sudo nvidia-settings

Or, as root:

root@linux: # nividia-settings

If you do not want to write the changes to your xorg.conf file simply run the nVidia Settings program (nvidia-settings) from your desktop's menu, usually in an administration or system menu, or from the terminal as a normal user run:

user@linux:~ $ nvidia-settings

Once you have opened nVidia Settings, click on X Server Display Configuration. Then select the monitor you are wanting to use as your second monitor and click Configure.

After clicking Configure, select TwinView. Then click OK.

Click Apply and if you are happy with the way things look click Keep to keep your new settings. Don't worry if all goes wrong the settings will return back to the previous settings in 15 seconds without any action. nVidia Settings should take care of selecting your optimum resolution etc, but that can be changed as needed. When you are happy with everything click on Save to X Configuration File.

Click Save and you should be set. You may want to restart X or your machine just to make sure all the settings carry over the next time you log in.

Linux Systems With Intel Video

Generally systems with Intel video cards work very well. They are well supported by open source drivers. There are, however, a couple of issues that may require some work arounds.

Resolution Issue

There is a limitation with certain cards which limits the total resolution to 2048x2048, so both monitors can not have a total resolution totaling more than that. To work around this it may be necessary to position your monitor as a top or bottom monitor as opposed to the typical side by side setup. This can easily be accomplished through your desktop's control of monitors. Please see the sections on dual monitors with KDE and GNOME above.

Primary Monitor Issues

With certain cards your system may get confused on what is the primary display. For example many users will be using a laptop. You will want your laptop screen to be the primary screen, and your projector to be the secondary monitor. Certain Intel cards reverse this. To work around this you will need to know the name of your monitor. If you are a KDE user this info is given to you in the display settings. If you are not using KDE enter the following in a terminal without your projector connected to your computer:

user@linux:~ $ xrandr -q

This will give you a long string of output. Screen names will be something along the lines of LVDM, VGA-0 or some convention similar to that. Without your projector connected to your computer only one monitor will show as being connected. That will be the monitor you will need to use as the primary. Now connect your projector and enter:

user@linux:~ $ xrandr --output LVDM --primary

Note it has been reported that when this issue is occurring you will not want to connect your projector until your desktop is running.