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I have a Lenovo ThinkPad with Windows 7.

I can hear sound when my laptop is powered up on AC power. While on battery power I can not hear streaming media, such as YouTube.

I was informed that I should change my power settings to be able to hear sound while watching videos on battery power. How do I do that?

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Try Fn + F3 to go to the settings. –  ott-- Feb 21 '13 at 21:21
    
Your model number would help. Have you tried adjusting the Lenovo Power Management settings for battery power? –  CharlieRB Feb 22 '13 at 14:04
    
Here is a Lenovo Thinkpad tutorial for Using Power Manager in Windows® 7 Tutorial –  CharlieRB Feb 22 '13 at 14:21

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