I currently experience wifi driver issue with eOS 5.1 / Hera on Kernel version 5.0 live-running on Dell XPS 15 (7590) FHD.
I get no wifi out of the box, it doesn't recognize any wifi card.
when i do sudo lshw -C network , I only see the Bluetooth card.
Unfortunately, the laptop doesn't have an Ethernet card, therefore i could only access internet thru usb tethering ( didn't work) or bluetooth ( didn't work).
After doing some research I found the issue could be the kernel, and said kernel needs to be update to 5.1 or higher version.
I just tried PopOS ( the latest version as of this writing ) and it comes with kernel 5.3. -> all works fine, wifi card is recognized and works no problem.
eOS team needs to update the kernel to +5.1
I just tried the latest of Elementary OS 5.1 with kernel 5.3 finally. Guess what ? ---> NO MORE WIFI PROBLEMS & BT works great as well from the live-usb. Now I'm considering seriously installing it.
Thanks eOS Team