On 06/02/15 11:33, Csányi Pál wrote: > But, when I start X with 'startx' command, I get the error mentioned > in subject of this mail. > > What am I missing here? > Since xorg-server 1.16, X is rootless by default (see https://www.archlinux.org/news/xorg-server-116-is-now-available/). This doesn't work out of the box with proprietary drivers, so create a file */etc/X11/Xwrapper.config* with the content *needs_root_rights = no* (see https://wiki.archlinux.org/index.php/Xorg#Rootless_Xorg_.28v1.16.29).