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After upgrade from 12.04 to 12.10 I can't work with dual monitor

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http://askubuntu.com – after Upgrade from 12.04 to 12.10 I can't work with dual monitors. The desktop is freezing after a short while when I attache the second Monitor. I can use the touchpad, but the desktop isn't reacting anymore. Sometimes I can switch with Ctr-Alt-F1 to terminal-mode, but i can't restart lightdm or something else, just reboot. 12.04 was working perfectly with two monitors. The only error-message I found in syslog: gnome-session[2237]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Die Ressource ist zur Zeit nicht verfügbar (The resource is not available)) on X server :0.#012 I don't know (HowTos)

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Submitted by Danial on 10/24/2012 – Made popular on 10/24/2012

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