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Bug#696531: Power saving regression on Sandy Bridge



On Sat, 2012-12-22 at 14:42 +0100, Juliusz Chroboczek wrote:
> 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

Yes, this looks like the same bug.  Based on
<https://bugs.freedesktop.org/show_bug.cgi?id=54089#c48> I expect that
we'll have to wait for a backported bug fix in the 3.7.y stable series.

Ben.

-- 
Ben Hutchings
One of the nice things about standards is that there are so many of them.

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