bastafidli, even though your screen is no longer scrolling, I suspect
your keystrokes are still being sent to both X.Org and a tty. This is
dangerous, because when you enter your login details in GDM, you could
not only be logging in to your GNOME session, but also unknowingly
executing commands in an invisible command shell.

To test this, reboot, log in to GDM as normal, click Places > Home
Folder. Then, while you are looking at your Nautilus window, type "touch
test" and press Enter. If a file called "test" appears in your home
folder, then you are affected by this. The way I solved it was to not
have a getty running on the tty I run X.Org on -- there is a udev config
file you can edit to control this.

-- 
(Multiseat) screen shifts when /dev/console written to
https://bugs.launchpad.net/bugs/153425
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