Pls help: laptop's HDMI out states max 2 channels, wtf?!

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kinosfronimos

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And yet further down the rabbit hole of setup mastery, there's always another impossible snag...

My current setup is laptop HDMI -> AVR (Cambridge Audio Azur 540R) -> 3.1 speakers and TV.

So with this setup, my AVR indicates digital signal received, but only 2 front channels.
I've tested the AVR by adding my external soundcard (Asus U3) with digital audio out via optical to the AVR, and the receiver properly receives and decodes both DTS & DD when playing an appropriatly encoded MKV - so it's not an issue of an old tech AVR.

When looking at the HDMI digital jack on Windows, the driver/controller is called Intel(R) Display Audio, which I duly updated.
This driver/controller still still reads as having 2 channels max.
Wtf.
Any one know how to force the output of 5.1 discreet channels over HDMI?
Pls help, I was up late for hours and hours with no success.
 
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