No audio in Dark Souls Prepare to Die Edition after Windows 10 Upgrade

After upgrading to Windows 10, I no longer get any audio when playing Dark Souls.
The strange thing however, is that if I restart the game in windowed mode, audio works perfectly fine.
In full-screen, I tried alt-tabbing, checking the volume mixer, and nothing seems astray, apart from Dark Souls not outputting any audio.
I have tried all the usual troubleshooting steps (ensuring latest drivers, restarting, uninstalling the game and re-installing), but nada.
Prior to Windows 10, I had 8.1, and the game worked flawlessly.
PC specs are as follows:
Operating System: Windows 10 Home Single Language 64-bit (10.0, Build 10240) (10240.th1.150810-2333)
Language: English (Regional Setting: English)
System Manufacturer: Hewlett-Packard
System Model: HP OMEN Notebook PC 15
BIOS: F.23
Processor: Intel(R) Core(TM) i7-4710HQ CPU @ 2.50GHz (8 CPUs), ~2.5GHz
Memory: 16384MB RAM
Available OS Memory: 16310MB RAM
Page File: 5259MB used, 13482MB available
Windows Dir: C:\WINDOWS
DirectX Version: 12
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 144 DPI (150 percent)
DWM DPI Scaling: UnKnown
Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Supported
DxDiag Version: 10.00.10240.16384 64bit Unicode
-------------
Sound Devices
Description: SONY TV (Intel(R) Display Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_8086&DEV_2807&SUBSYS_80860101&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: IntcDAud.sys
Driver Version: 6.16.0000.3154 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 4/5/2015 23:53:29, 454416 bytes
Other Files:
Driver Provider: Intel(R) Corporation
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Best Answer
Since I found out that there's something funky going on with HDMI audio, I set the headphone jack to be the default audio output device and plugged that into the TV, which got the sound working again in full screen.
Thanks for everyone's help.
Edit:
Another problem I faced was using InputMapper for my DS4 Controller as well, it refused to start in exclusive mode.
I tried the suggested fix suggested here, which didn't seem to work. I then tried unplugging the HDMI cable, and attempting the suggested fix (using the laptop's screen only), after which the controller worked again. Not only that, DaS worked flawlessly with audio in full screen as well.
It definitely seems like there has been a change in how Windows 10 handles HDMI audio/video output during startup.
I do hope that Microsoft pushes a fix for this in the future.
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Why is my game audio not working Windows 10?
If you have no sound in games when playing in Windows 10, this might be caused by the sound settings or your output device. Try to disable and enable your speakers or headphones from the audio properties. Updating the drivers can also fix this problem so make sure you perform our indicated steps.Why is my game audio not playing?
If you cannot hear in-game audio (even if you still get audio for other programs), your audio output device may not be set to default. Your default device will have a green check. If there's no green check on the device you're using, right click the name of the device and set it to default.Does Dark Souls work on Windows 10?
Recommended: OS: Windows 10 64-bit. Processor: Intel Core i5-4570 3.2 GHz / AMD FX-8350 4.2 GHz. Memory: 8 GB RAM.Can you still get Dark Souls: Prepare to Die Edition?
Delisting. Dark Souls: Prepare to Die Edition was delisted from Steam on May 8th, 2018. The game's store page and title remain but the purchase link redirects to Dark Souls: Remastered. The remastered version was released on May 23rd, 2018 on Steam, and also came to PlayStation 4, Xbox One, and Nintendo Switch.DSFix Installation \u0026 Configuration Guide, How to / Tutorial | Dark Souls
More answers regarding no audio in Dark Souls Prepare to Die Edition after Windows 10 Upgrade
Answer 2
I had the same problem.
I went back to check the problem and found out that the reason it actually worked was because before using nahimic, I went to control panel, then under Sound I went to manage audio devices, in the playback tab I went to Speakers, then went to properties and then to the spatial sound tab and changed it to windows sonic for headphones.
You could try it and see if your Dark Souls Prepare to Die Edition/ Dark Souls Remastered gets its audio back.
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Images: Maria Lindsey Content Creator, Erkam Hayta, Plato Terentev, Flora Westbrook