For me it is solved with kernel 3.13.0-32 from https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa Careful users should wait a few days to get the fixed kernel as a normal update!
From what I have read the problem was a kernel patch called "ACPI / AC: convert ACPI ac driver to platform bus" which has now been reverted in kernel 3.13.0-31 and higher.
For me it is solved with kernel 3.13.0-32 from https:/ /launchpad. net/~canonical- kernel- team/+archive/ ubuntu/ ppa
Careful users should wait a few days to get the fixed kernel as a normal update!
From what I have read the problem was a kernel patch called "ACPI / AC: convert ACPI ac driver to platform bus" which has now been reverted in kernel 3.13.0-31 and higher.