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I think I do not have problem with hardware. Sometimes the WiFi connection simply disconnects, apparently. So this is not necessarily the same as this case, I might not need to reload any modules.

But how to just restart wlan0? I tried restart network-manager, but this seems to leave wlan0 alone.

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3 Answers 3

You just need to restart Network Manager:

sudo service network-manager restart
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Try this:

ifconfig wlan0 down
ifconfig wlan0 up
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You could try killing the power to your device. Assuming you are unable/unwilling to physically disconnect the device, you should run (as root): iwconfig wlan0 txpower off. I would then wait 10-15 seconds to make sure whatever hardware issue has caused the problem has been stopped, then: iwconfig wlan0 txpower auto.

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