Public bug reported:

Wireless activity LED indicator on Acer Aspire 5520 laptop does not
work, it stays off all the time.

This can be fixed by entering following rows in /etc/rc.local

sysctl -w dev.wifi0.ledpin=3
sysctl -w dev.wifi0.softled=1

as explained here:

https://wiki.ubuntu.com/LaptopTestingTeam/AcerAspire5520#WirelessLed

but it appears the switches will be removed in newer kernels.

The same thing is known to happen on AspireOne that uses same wireless
adapter, see

https://bugs.launchpad.net/ubuntu/+bug/284474

(not sure if this should be marked as duplicated).

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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Acer Aspire 5520 wireless activity LED indicator does not work
https://bugs.launchpad.net/bugs/286270
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