I have a new Gigabyte GA-H77M-D3H motherboard and It works ok, except the integrated Atheros GbE Lan chip (AR8161 Gigabit Ethernet).
Atheros Communications Inc. AR8161 Gigabit Ethernet
I installed linux-backports-modules-cw-3.6 package and ethernet has been detected and apparently works fine, but when I browse (firefox and chrome browsers tested) in multimedia pages, for example in youtube.com, the internet connection is lost ( eth0 is up). The problem in more habitual in webs using flash, but in other pages occurs too.
In syslog and dmesg I view nothing strange.
I disabled this ethernet in the BIOS and I installed a new RTL8169SC. The problem persist, but is less habitual.
I have uninstalled flashplugin and use html5 mode in youtube, but the problem persist.
I don't know where I can watch.
My System: 3.5.0-25-generic x86_64 ubuntu 12.10
UPDATE: After few hours running, the computer is freeze. I think the problem now is the sound. Only occurs when I am playing music with Clementine or Rhythmbox. I don't recommend this motherboard for ubuntu.
UPDATE: Some times, errors in: "/usr/lib/upower/upowerd" !!!
UPDATE: More problems and one solution, replace motherboard with other: Disabling IRQ #16 and *BAD*gran_size