Re: X.org works on <= 14.3, unusable on >= 14.4

A couple of things more:

* Your user should be in the "video" group.
* What's inside your graphical session? Plasma, GNOME, something simple?
* How do you enter the graphical session? Some kind of display manager
or "startx"?

If you're using KDE Plasma, let's try following:

echo xterm > ~/.xinitrc
startx

In the graphical session run

tail -F /var/log/Xorg.0.log

to see if the flickering is here.