Public bug reported:

Running Ubuntu 11.10, a fresh install, on a Acer Aspire One D255. Dual core 
Intel Atom N550, 1GB DDR3, Intel Centrino Wireless-N (works quite well) and an 
Atheros Ethernet that works fine for 30 minutes, top. After a random while it 
freezes the connection.
Neither side of the transference notices, even the lights on my router are 
still on (just stop blinking).
Network manager reports the connection status as it was previous to the freeze.
Any attempt to restore the functionality does not work, only rebooting. That 
includes rmmod atl1c and reloading the module, stopping the connection from 
NM-applet (won't come back).
some times the system freezes, but i do not know if it's related.

$ lsb_release -rd

Description:    Ubuntu 11.10
Release:        11.10

$ apt-cache policy linux

linux:
  Instalados: (ninguno)
  Candidato:  3.0.0.12.14
  Tabla de versiĆ³n:
     3.0.0.12.14 0
        500 http://ar.archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: ar8152 atl1c ethernet oneiric

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https://bugs.launchpad.net/bugs/881270

Title:
  Atheros AR8152 v1.1 (rev c1) ethernet freezes connection

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