I also experience this from time to time on a Fujitsu Lifebook C1211D with an Atheros chipset.
As a workaround, I disable networking (right click nm-applet, uncheck enable networking) and then enable it again.
I also experience this from time to time on a Fujitsu Lifebook C1211D with an Atheros chipset.
As a workaround, I disable networking (right click nm-applet, uncheck enable networking) and then enable it again.