Bug#696531: Power saving regression on Sandy Bridge

[Juliusz Chroboczek <jch@pps.jussieu.fr>]

Package: linux-image-3.6-trunk-amd64
Version: 3.6-1~experimental.1

Hi,

On Dell Latitude E6220 (Sandy Bridge i5-2520M, integrated graphics),
power saving stops working after some time.  The symptoms are that idle
power consumption goes from 7W to 28W (!), and Powertop reports that PC7
is never entered.  A reliable way to reproduce it is to suspend the
laptop, but it sometimes happens spontaneously.

This is most possibly identical to

  https://bugs.freedesktop.org/show_bug.cgi?id=54089

-- Juliusz