When i had a very old Samsung tv, my Nvidia Geforce videocard produced a nice image to the tv and Dolby AC3 sound to my even older surround set via a nice hdmi

When i had a very old Samsung tv, my Nvidia Geforce videocard produced a nice image to the tv and Dolby AC3 sound to my even older surround set via a nice hdmi to optical out converter in between. Now i have a not-so-old Philips tv and suddenly i can't get dolby ac3 sound anymore. Why? Because the GeForce communicates with the tv and the tv responds it only has stereo. The surround set has no hdmi input or output so it cannot communicate with GeForce. I have tried everything from hacking drivers to changing EDID with some weird devices. Nothing works. Stereo only. Very frustrating. I was recommended to replace my surround set or my tv. Both pretty expensive solutions for some weird hdmi communication bug/standard. So i bought a $20 usb sound device to get Dolby AC3 sound to my suround set. All because i replaced my old tv which couldn't communicate with the GeForce about its speaker setup.