you should read the
README of everything you install from SlackBuilds.org
Quote:
Originally Posted by xf86-video-qxl's README
It's meant to be used only in your virtualized guests.
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the package install a /usr/share/X11/xorg.conf.d/05-qxl.conf file meant to be used only in virtual machine with the qxl driver enabled: remove the package and that file and X should work again.