Found a fix :
Get into Bios (F2 At boot)
Go to : Power Management -> Wireless Radio Control -> Turn everything OFF
This prevents hardware lock of wifi card when going into suspend and
undocking from Dell dock.
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Bugs, which
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
tried to use rfkill to bring the wifi card back, fails :
after wake from suspend :
gilbert@alpha:~$ sudo rfkill list
1: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
2: dell-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
3: phy0: Wireless LAN
