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Join Date: Jan 2001
Location: upstate NY
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Have you tried turning on Dolby ProLogic decoding in your receiver?
Make sure that the graphics driver for your laptop is up to date. Drivers change often enough that even new computers are shipped with older (more buggy) versions. If possible, download them from the manufacturer of your graphics chipset. Don't depend on Microsoft's update service.
Even with updated drivers, too often the source material is provided with just the front two channels active while the audio soundtrack itself contains incorrect flags which claim that it contains 5.1 channels or more. In that case, Dolby ProLogic can't process the stereo audio to produce multichannel surround sound. So far as the receiver is concerned, it's already providing full surround sound.
One way to get around this is to change the settings in Windows (which I assume you're using) to output only stereo over HDMI. Then ProLogic in the receiver can do its thing.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped