GDM: (F17, all updates) When I try to log in, login fails and I get switched to a different VT

[Kamil Paral]

> https://bugzilla.redhat.com/show_bug.cgi?id=823485

> Anybody else seeing this?

> Details:

> I am running F17 x86_64 with all updates from updates-testing.

> I can't log in. When I click my name in gdm and enter my password,
> the display immediately switches to a different (text) VT, and when
> I switch back to the GDM VT, it's back at the login screen.

> I can't find anything in /var/log/messages, dmesg output,
> ~/.xsession-errors, or /var/log/Xorg.0.log to explain this.
> I have auto-login configured, and if I reboot my machine, I _am_
> logged in successfully. It's only when I log out and log back in
> again that the login fails.

It seems Xserver is crashing. After the crash have a look at /var/log/Xorg.0.log.old and `dmesg` output.