Sub not running from headphone jack

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I have this puzzling problem, I have a laptop hooked up to a HP HDX that uses IDC Audio control. Its connected via headphone jack to a Logitec Z623. The problem is the speakers wont produce sub-woofer sound anymore when connected to the laptop but when it's connected to any other device it works just fine. Everything was working just fine for over 2 years and just recently it started to do this. If anyone could shed some light of fixing this problem please do.
 
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