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I butchered the title to fit...
Sometimes when I wake my laptop up from sleep, there is no networkmanager applet visible in the top-bar. I am also not connected to the internet.
If I put it back to sleep and wake it up again, it usually comes back up properly.
Also, sometimes GNOME asks for my password when I tell it to sleep. Sometimes it doesn't. I can't help but think that these things my be related.
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