[Bug 96645] [regression 4.7] [BISECT]Low package c-states used only after forcing DPMS to off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96645

--- Comment #11 from Gabriele Mazzotta <gabriele.mzt at gmail.com> ---
(In reply to Dorota Czaplejewicz from comment #10)
> I have tried to reproduce this on a HSW-4770R machine, but I'm not sure
> whether I got matching reasults.
> 
> Cputop shows available package states: C3, C6. System stays in C3 after SATA
> link management enabled, never enters C6. Toggling DPMS has no effect. The
> machine doesn't have a display connected.

I don't know what cputop is, I use powertop to have an overview of the current
state, so I don't know if you are referring to the core c-state or package
c-states. I'm having issues with the package c-states.

> Does it seem similar to the symptoms of this bug?

What I reported is a regression. With v4.6 or older the CPU could enter pc7,
now I have to toggle DPMS. If your CPU could enter some package c-states with
v4.6 that can no longer enter with newer kernel, then yes, your system is
affected by the same bug.

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