5.1 Surround Sound on Acer Aspire Laptop Help Needed

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http://www.linuxquestions.org – Sound: Hello, I am running Fedora 13 64bit with Gnome, on Acer Aspire 7730ZG Laptop with Dobly Home Theater Surround Sound 5.1. When I goto sound Sound Preferences, click the hardware tab,I select Analog Surround 5.1 Output and select Test Speakers, Only the Front Right, Front Left, Front Center have the test sounds working. The Rear Left, Rear Right, Subwoof Do not play the test sound. the device from lspci is: 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) Any ideas? thanks (HowTos)