I'm using Fedora 20 on a Lenovo Thinkpad X220. After installing updates for Fedora 20 and rebooting, I'm now facing a fixed console display while I would expect a GDM login screen. GDM is started and Xorg server is running and alive: according to server log, it detects VT switch and handle it (I have to hit CTRL+ALT-F2 to exit from the first console, while I have to hit CTRL-F1 to go back to the console used by X / GDM). But the first virtual console which is devoted to X only show the boot messages and don't support any interaction (mouse, keyboard). I have tested with kernel option i915.modeset=1 added on command line through grub without any change on the behavor.
After downgrading libevdev (from -testing), graphical login screen is shown on the computer. libevdev-0.6-1.fc20.x86_64 was installed from testing repo, downgrading to libevdev-0.5-1.fc20.x86_64 fix my problem. My issue is reported https://admin.fedoraproject.org/updates/FEDORA-2013-23934/libevdev-0.6-1.fc20?_csrf_token=637132ef43236645ce9d396b74eefbb45ff2668b
*** This bug has been marked as a duplicate of bug 1046426 ***