
NOTE: Some window managers (such as GNOME) allow you to modify display preferences, which can
sometimes result in the creation of the following le:
$HOME/.config/monitors.xml
When you log in to the system and a window manager starts a session, it uses information from this le to set
the current desktop resolution. This can reverse the resolution matching performed by RGS and cause the
desktop to be set to an undesired resolution.
For example, if you set the desktop resolution of the sender to 1024x768 using a window manager, that
resolution is stored in monitors.xml. If an RGS connection is then established with display resolution
matching enabled on a receiver with a resolution of 1920x1200, the sender display resolution changes to
1920x1200 and then to 1024x768. There is no
notication that the resolution match request failed (because
it did not).
To avoid this behavior, avoid setting the resolution using window manager controls. It is safe to delete
monitors.xml to restore display resolution matching functionality. See the documentation for your
operating system or window manager for more information about where and how it manages display
settings.
Conguring the X server
The X server can be congured in several dierent ways. This section describes the suggested methods for
two dierent scenarios.
Scenario 1: All receivers have the same conguration
If all receivers have the same conguration, then using the Virtual entry under the Screen section of the le
xorg.conf is the easiest method.
For example, if all receivers have four monitors congured at 1280x1024 each, congure the X server to run
at a resolution of 5120x1024 by making the following additions to the le xorg.conf.
Add the following under the Device section:
Option "UseDisplayDevice" "none"
Option "UseEDID" "false"
Add the following under the Screen section:
SubSection "Display"
Virtual 5120 1024
Depth 24
EndSubSection
Now the X server is congured to have a single screen running at a resolution of 5120x1024, which covers all
four of the receiver’s monitors. You can use this method to support a very large virtual display limited only by
frame buer memory.
Scenario 2: Some receivers have dierent congurations
In the more likely scenario where you need to support many dierent display resolution and monitor
congurations, you can use the NVIDIA TwinView® mode to match the resolutions. TwinView mode is where
two display devices (digital at panels, CRTs) can display the contents of a single X screen in dierent
congurations. This method for using multiple monitors has the following distinct advantages over other
techniques such as Xinerama (which is not supported by RGS):
36 Chapter 6 Using RGS features
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