[ubuntu] wifi turns off when lcd display goes to sleep

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http://ubuntuforums.org – Hello.. I observed that when my laptop's screen goes to sleep after its been inactive for a few minutes (I set it to 5 minutes in the power management gui), the wifi also disconnects. This is a problem if i'm downloading large files. I am using lucid beta and the laptop is a thinkpad edge amd turion neo x2 version. Am I missing some settings? Is there a way to not let the wifi sleep together with the screen? Hope somebody can help. Thank you very much!;) (Hardware)