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Problems with an external monitor: total system lock-up, freezes

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linux-howto

http://askubuntu.com – I am running ubuntu 12.10 on the sony vaio fw250j (intel integrated system). I'm trying to use this machine as a home media center, but i noticed whenever I turn off the televisn connected using an HDMI cable, the computer freezes. You turn the television back on and the same screen is up, but the clock reads the time the television turned off and the keyboard and mouse are unresponsive. I think it's a power management thing where the system gets stuck searching for an output screen. Any ideas would be great! (HowTos)