Update from user = I have updated to BIOS 1.7.0 and so far so good.
I have an LG ultrafine 27UP850 external monitor that has built-in speakers and they have been working fine until a recent Dell firmware update that windows installed (bios) and now the speakers will not work. I have tried restarting unplugging the usb-c cable and trying a different port nothing works.   Any suggestions? Is there something in the bios I need to change?
XPS 9510 no sound from monitor speakers