Gnome defaults to wayland; how can I go to back to X11?

Question

I updated Gnome to the newest version and I realized that wayland has been installed as the default window manager. I have many problems with it, so how do I go to back to X11?

I'm using Arch.

//EDIT

Problem solved. I just delete old x11 config and create new one :)

echo $XDG_SESSION_TYPE returns X11 :)

Solution

In gdm, you should have a little gear bellow the field you are entering your password. There you should be able to select the X11 session

Comments

[Rarez]

Yes Im able to choose beetwen Xorg and Wayland session problem is when Im choosing Xorg I have black mirror for 1-2 sec and then again back to field when you are entering your password

[Rarez]

Now I have another problem :/ Failed to contact accountsservice, AccountsService: Failed to create accounts proxy: