Paolo Galtieri writes:

I ran

rfkill list:

0: dell-rbtn: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: yes

I then tried running

sudo rfkill unblock wlan

and then

rfkill list:

0: dell-rbtn: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: yes

It still shows that it's hard blocked.

"Hard blocked" suggests there's a hardware switch on the laptop that's flipped to kill the Wifi.

It's weird how you claim the Wifi works after a reboot, but shuts off after a suspend/resume cycle.

This may not be a physical switch, but many laptops have a FN key combination that disables WiFi, sort of like a hybrid soft/hard lock. Just a wild guess, but the laptop might "forget" after it reboots that this key combination was pressed, but the bit still stays stuck somewhere, and the suspend/restore cycle makes the laptop's hardware suddenly realize (oh, my Wifi should be off).

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