The HDA specification introduced around 2005-2006 which became mass market in time for Windows Vista not only improved the performance characteristics of audio reproduction but changed the architecture of the audio system and its software, allowing greater flexibility with regards to audio connections and routing. Under AC/97 the audio system could not differentiate between different connections very well.
The audio system itself and its device delivers and software were blind to which connectors were being used and later audio solutions which added jack detection could only sense that a device was plugged in or at most what kind of device. This was achieved by changing a number of jumpers on the system motherboard to configure the desired setting and if required connecting the front audio sockets to the motherboard. The AC/97 standard only really supported front audio ports by means of redirecting or routing the audio signal, meaning that the system integrator, OEM or DIY user could select if they wanted to send the audio signals to the rear audio connectors or the front audio connectors, but not both at the same time.
Both of these specifications were spearheaded and published by Intel with input by other vendors such as Microsoft. The original specification was called AC/97 (Audio-CODEC and the year of drafting) and a later successor, the much improved HDA specification (High Definition Audio) also known by its codename, Azalia.
There are two industry standards/specifications covering the front audio connectors on a PC chassis. If you cannot hear any audio via your front audio ports and you have a relatively modern system there is a easy fix for the problem. Hardware or software can often be non-compliant. When things do not work as expected it is often due to standards not being followed.
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