GDM (Gnome 3.18, Fedora 23) hangs after login. Where to dig?

Question

Gnome

Good afternoon. I ran out of requests for Google, I ask for help from toaster subscribers.
It was Fedora 21. At the time of installation, there were no problems, everything worked properly.
A couple of days ago I decided to upgrade to the 23rd fedora, by completely reinstalling the system.
However, after reinstalling, Gnome stopped running.
At the same time, at first I see the password entry window (as I understand it, GDM starts normally), but immediately after entering the login and password, the system hangs tightly. Sometimes a cursor is visible on the screen that does not move. The keyboard does not work, does not respond to any combinations (including ctrl + alt + f2)
However, if you boot in console mode, then log in to the console and then run X through startx, then the gnome starts up normally, everything works.
The Xorg logs are empty. There are no errors.
I can't find gdm logs. /var/log/gdm is empty.
There is no .xsession-errors file anywhere at all.
Tell me where to dig? How to make it so that at least get a log.
PS Video card

lspci | grep -i vga
01:00.0 VGA compatible controller: NVIDIA Corporation GK110 [GeForce GTX TITAN] (rev a1)

It is in the list of supported nouveau. I tried to install nvidia drivers, but I couldn't, they don't compile (I disabled the nouveu module), although everything compiled fine for the 21st Fedora. But, in this case, I'm not sure that the problem is in the video card. For the gnome itself starts normally through startx.

Answer 1

Ndam, it looks like this bug has been dragging on since the 22nd fedora.
https://bugzilla.redhat.com/show_bug.cgi?id=1169762
In general, I was able to reinstall the drivers.
This article helped a lot
www.if-not-true-then-false.com/2015/fedora-nvidia-guide
There is a very important point that is not in other similar manuals - you need to downgrade xorg
At the same time, this moment worked for me in this sequence
- first compiled the driver
- then downgrade xorg -
then compiled the drivers again