Description of problem:

Since the latest 'yum update', the Xorg x-server does not tolerate the undocumented -listen option anymore (as the opposite of -nolisten). Lightdm puts either -listen tcp or -nolisten tcp on X' command line, depending on the xserver-allow-tcp config item value true or false. Therefore the value true for this item does not work anymore and makes the Xorg terminate immediately with nonzero exit status and the appropriate message that an unsupported command line option was passed. I also posted the bug on lightdm mailing list, but until they fix the bug, I suggest to put a filter for this -listen option in the /usr/bin/X script, like:

filter() {
        local i s=false
        for i
        do
                if $s
                then
                        s=false
                elif [ "$i" = -listen ]
                then
                        s=true
                else
                        echo "$i"
                fi
        done
}

basedir=/usr/libexec
if [ -x "$basedir"/Xorg.wrap ]; then
        exec "$basedir"/Xorg.wrap $(filter "$@")
else
        exec "$basedir"/Xorg.bin $(filter "$@")
fi


Version-Release number of selected component (if applicable):
lightdm-1.10.5-2.fc21.x86_64
xorg-x11-server-Xorg-1.16.3-2.fc21.x86_64


How reproducible:

Steps to Reproduce:
1. set the lightdm config option 'xserver-allow-tcp' to 'true'
2. reboot

Actual results:
The graphical screen won't start.

Expected results:
The graphical screen starts and X-server listens on tcp port 6000.

Additional info:
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