Note : it might be a problem in the ilwifi driver. I am not sure.
Perhaps rf-kill does the block properly on suspend
But fails to unblock the card because the ilwifi driver does not bring it back 
from "hardware lock" to "available" on resume.
So I am not sure of where the problem is, but I tend to think that it's a 
ilwifi problem :/

https://bugs.launchpad.net/ubuntu/+source/backport-iwlwifi-
dkms/+bug/1947561

How can I make sure rfkill does ask properly to the kernel/module to
unlock the hardware wifi card, and confirm this is a ilwifi problem ?

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https://bugs.launchpad.net/bugs/1947558

Title:
  rfkill fails to turn on wifi card on Dell Latitude 5490

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