Frédéric Bron composed on 2017-06-27 14:25 (UTC+0200):
Have you already done a distro-sync, or tried uninstalling sddm before trying
startx? KDM still works in all F25 & F26 64 bit installations here. Elsewhere
more than once I've seem Plasma trouble solved by eliminating sddm from the system.
Have you already tried uninstalling the nouveau driver? Xorg should fall back to
using the integral modeset driver automatically unless your NV gfxcard is too
old or too new.
If nothing else has helped as yet, provide hardware information:
lspci -nnk | grep -A5 VGA (pasted here and bug)
Xorg.0.log (attached to bug)
journalctl -b _COMM=Xorg.bin (attached to bug)
if exists, /etc/X11/xorg.conf or /etc/X11/xorg.conf.d/*
See also: https://fedoraproject.org/wiki/How_to_debug_Xorg_problems
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