Normal users can't connect to X

Suddenly, my user  can't login into X sever, and I got the following error in the file /var/log/Xorg.0.log

[   157.920] (EE) Error compiling keymap (server-0)
[   157.920] (EE) XKB: Couldn't compile keymap
[   157.920] (EE) XKB: Failed to load keymap. Loading default keymap instead.
[   157.944] (EE) Error compiling keymap (server-0)
[   157.944] (EE) XKB: Couldn't compile keymap
[   157.944] XKB: Failed to compile keymap
[   157.944] Keyboard initialization failed. This could be a missing or incorrect setup of xkeyboard-config.
[   157.944]

Just login in a console as root (e.g. atl+f1) and type

#chmod ug+rwx,o+rwt /tmp

then reboot

Source:

http://forums.debian.net/viewtopic.php?f=6&t=47031

http://forums.debian.net/viewtopic.php?f=6&t=47759