Please show us output from
inxi -Gxx
run in Konsole, Gnome Terminal or Xterm. Also upload /var/log/Xorg.0.log to any of these:
http://susepaste.org/
http://paste.opensuse.org/
http://pastebin.centos.org/
http://paste.debian.net/
http://paste.fedoraproject.org
http://pastebin.com/
http://paste.ubuntu.com/
https://gist.github.com/
Using the susepaste command makes uploading easy.
How are you starting your Gnome session? From GDM? SDDM? LightDM? Startx?
Is 1440x900 the native mode of a connected display?
xrandr commands don’t stick from session to session. You could put them in a script in /etc/X11/xinit/xinitrc.d/ to have them run at each X startup.