After more researching I got to conclusion that this is indeed kernel bug..
sorry for spamming. I am ready for bisecting. :)
I did this:
git checkout -b mybisect origin/master
...
git bisect start Ubuntu-3.8.0-26.38 Ubuntu-3.8.0-0.1
and got this:
warning: refname 'Ubuntu-3.8.0-0.1' is ambiguous.
Bisecting: a merge base must be tested
[9931faca02c604c22335f5a935a501bb2ace6e20] Linux 3.8-rc3
any clues?
** Package changed: network-manager (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1173279
Title:
1969:2062 Atheros AR8152 v2.0 Fast Ethernet (rev c1) stops working
after some minutes
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