After release of ubuntu 12.04.2 I tried update my system with:
sudo apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal
unfortunately after that my network was not working. It just started infinity reconnection loop. With something like this in syslog:
device state change: unavailable -> disconnected (reason 'carrier-changed')
Looks like problem in new e1000e kernel embedded driver because when i downgrade to 3.2.0-38 all worked fine.
My hardware is thinkpad x230 with core i7.
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04) Subsystem: Lenovo Device 21f3 Flags: bus master, fast devsel, latency 0, IRQ 42 Memory at f2500000 (32-bit, non-prefetchable) [size=128K] Memory at f253b000 (32-bit, non-prefetchable) [size=4K] I/O ports at 5080 [size=32] Capabilities: <access denied> Kernel driver in use: e1000e Kernel modules: e1000e
Now i work with older kernel. But i have good reproduction of this problem and i can provide any needed additional info. So maybe i can help solve this issues but i have no ideas how.