[ubuntu] Wake up from suspend - Alarm Clock

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http://ubuntuforums.org – Hello guys, I completely switched to Ubuntu a few months ago. I want to wake up with the computer from suspend. In windows I used scheduled tasks and tick a option to wake the computer for this task. In Ubuntu I set a cron job, but I don't how to make the computer to wake up from suspend. Is it possible? I use Ubuntu 12.04 LTS, and my MB is H67MA-UD2H-B3, if it's something connected with the BIOS. (Hardware)