After reverse bisecting the kernel, the following commit, which seems to be part of a larger patch set for the e1000e driver, fixes the problem for me:
commit 63eb48f151b5f1d8dba35d6176d0d7c9643b33af Author: David Ertman <[email protected]> Date: Fri Feb 14 07:16:46 2014 +0000 e1000e Refactor of Runtime Power Management -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1261723 Title: [Lenovo ThinkPad X220] e1000e problem, system either reboots instead of power off or disables WOL To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261723/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
