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I used to use my Nokia N900 as usb-router for my computers on gnome2. All I had to do was plug my phone in and networkmanager automaticly created connection.
But after upgrading to gnome3 nothing happens when I plug it in
I made bug report about this to gnome, but there hasn't been any activity, so its probably Arch Linux releated problem.
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your report lacks any informations, like this post too. don't expect activity in here.
i do suggest to start posting relevant logs and details about your setup.
Give what you have. To someone, it may be better than you dare to think.
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