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I have added a synaptics.conf file under /etc/X11/xorg.conf.d/50-synaptics.conf. Do I need to restart X to see it applied?

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You can try out your settings by starting a new X with startx if you have a correct .XClients / .xinitrc, that is, there is a program at the end that keeps X running. Usually the program is a window manager (like /usr/bin/fluxbox) but I just entered /usr/bin/xterm. xset q might show you some values. Switch between the running X servers with ctrl-alt-F<n> (e.g. ctrl-alt-f7). – thomasa88 Dec 15 '13 at 17:19
thx for these details – javadba Dec 15 '13 at 18:42
up vote 8 down vote accepted

Yes. X.Org's configuration files are only read when the server is started.

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