Intel HD Audio, front panel jacks, Signal GND vs Chassis GND 2019-06-30 01:59:18 Some people experience noise when using their front panel jacks, especially when using USB ports. Sometimes it's due to how the PCB dongle in front of the PC Case is wired. Some of these PCBs have the Signal GND of the audio, bridged to the Ground for the USB devices, and then bridged to the Chassis GND.While the USB ports will probably have no issue sharing the ground with the chassis, they are all meant for "powered" devices. Signal Ground is not exactly the same thing. Now I've seen cases where Signal ground is meant to be connected to the chassis ground, and cases wheres it's not. And sometimes it is connected, but first passes thru a filter or other circuitry.In my PC Case I have two separate dongles, audio and USB on different sides. But the Audio dongle is still bridged to the chassis via the screws that hold the PCB in.I don't know what's the official stance of INTEL on their specification, I tried googling, didn't find nothing official. So this is my question here, Does anybody know about this? or something related?I've seen various guides on hacking the PCB to remove where it's bridged to ground. I did an easy test by unscrewing the PCB and leaving it in mid air, and testing my headphones. With the PCB not connected to the CHASSIS the front audio seemed perfect. But IDK what implications this may have in the long run. IDK if to proceed with modifying the PCB and make it permanent. In theory the sound card would handle the grounding on its end.