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Wi-Fi networks not detected anymore

rated 0 times [ 0] [ 0] / answers: 1 / hits: 4737 / 2 Years ago, tue, june 7, 2022, 12:33:49

Problem :

Wi-Fi networks not detected anymore

What triggered it ?

My computer froze and I ended up having to restart it using the power switch.
In case it could be relevant : it froze while I was using Calc, trying to drag and drop items (bug already filed in LibreOffice).

What have I attempted to solve it ?

I was under Kubuntu 13.10 when it happened, so I took this opportunity to reinstall the OS with Kubuntu 14.04 (no config files were kept), but it didn't solve it.

Current diagnosis :

When running "sudo iwlist wlan0 scan", "wlan0 No scan results" comes up.

The /var/lib/NetworkManager/NetworkManager.state shows :

NetworkingEnabled=true

WirelessEnabled=true

WWANEnabled=true

WimaxEnabled=true

WiMAXEnabled=true

What could I try ?

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tudatchful

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answered 2 Years ago raldership · Accepted Answer

It was a hardware problem more than a software one : I ended up resetting the BIOS to the default settings, but doing this wasn't enough : unplugging the charger cable and removing the battery before restarting my computer was needed too.

Maybe if I had just tried removing the battery and charger, without resetting the BIOS fist, it would have been enough (since I can't remember having made any significant change on the BIOS before), but I tried the other way round.

This problem was triggered when my virtual memory got overloaded, so I guess it makes sense it was solved when no energy was given to my laptop to keep anything in it.
Until now I thought rebooting a computer was enough to clean the memory, but apparently not.