When editing an X configuration file, know that each time the X server is started it writes out the log
. If the results are not as expected, or the
/var/log/XFree86.0.log or /var/log/Xorg.0.log
X server fails to start, this is the first place to look for clues.
Both the X server, and OEM accelerated drivers will write configuration confirmations, warnings, and
errors to this file. Nine times out of ten, you can resolve configuration issues based on output in this
There are a few notable limitations in Linux when configuring multiple monitors, especially with
multiple graphics cards. For one, on earlier consumer Red Hat releases (prior to Red Hat's Enterprise
Linux), the GNOME window manager did not handle independent displays correctly. In such cases
the KDE window manager should be used as it handles independent displays quite well. But, even
with KDE, a few anomalies may be noticed. One such anomaly is the toolbars might differ in style on
the primary display from the other independent displays. With the release of Red Hat Enterprise Linux,
the GNOME window manager has been improved greatly in that it now supports independent
displays. Further it has new functionality in being able to customize tool bars per display.