I was stupid enough to get another unit and update the BIOS, again!! (using ThinLinux_5060_BIOS_10K.zip with Dell Imaging Tool) Everything went smoothly first then onboard speaker started to make weird noises during Window 10 setup, and now it doesn't even work! Rolling back to 1.0A didn't make any difference!! This time I can see the drivers (under Windows & Linux) but no sound through the speaker or the headphone jack!!I didn't even notice this thing had onboard sound, lol.
I'm on BIOS 1.0a and sound works properly.
It's so weird! I'm testing using Debian, Window 10, and ThinLinux .. As of now:That is weird. Do you have another set of speakers you can try? If I remember correctly, Windows will show a red x on the taskbar speaker icon if there are no speakers detected. Worth checking to see if mute is on also.