The laptop has 3 jacks. 5.1/4.0 works fine in Windows 8.1 and I'm not talking about HDMI/SPDIF. If you look at the laptop specification, it says 1 x Microphone-in jack 2 x Headphone-out jack (SPDIF) But the microphone-in jack can also be an output. Also, the laptop has two microphones, a pair of speakers and a subwoofer
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I can also boot Windows and provide information, please let me know what you need.
It is strange that user guide is different from specification What are the icons near the jacks ?
Headphone output and S/PDIF output combo jack port This port allows you to connect your Notebook PC to amplified speakers or headphones. You can also use this port to connect your Notebook PC to Sony/Philips Digital Interconnect Format (S/PDIF) compliant devices.
Microphone input jack port The microphone input jack port is used to connect your Notebook PC to an external microphone.
Audio Input Jack The stereo input jack (1/8 inch) can be used to connect a stereo audio source to the Notebook PC