Comment 54 for bug 505452

In latest kernels the bug which causes wired ethernet adapter to stop working when using "acpi_osi=Linux " is fixed (2.6.34 and later).
People who are experiencing the bug can install new kernels from:
https://edge.launchpad.net/~leannogasawara/+archive/ppa
https://launchpad.net/~xorg-edgers/+archive/ppa
http://kernel.ubuntu.com/~kernel-ppa/mainline/

Also, I would like to recommend installing eee-control ( http://greg.geekmind.org/eee-control ) for those who need all the hotkeys working. deb package for ubuntu lucid can be found here -> http://greg.geekmind.org/eee-control/deb/eee-control_0.9.6_all.deb