[Bug 98979] [i915][HSW][PM] Unable to use GFX RC6 on Dell Precision M6800

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98979

--- Comment #4 from Shawn Starr <shawn.starr at rogers.com> ---
Correct, turbostat -d would not show 'GFX%rc6  GFXMHz' fields

and Powertop would not show:


                    |             GPU     |
                    |                     |
                    | Powered On  0.0%    |
                    | RC6       100.0%    |
                    | RC6p        0.0%    |
                    | RC6pp       0.0%    |


Disabling GVT might be cause, unsure, I will rebuild with this module enabled -
even though Haswell has no GVT support (unimplemented).

As for i915.enable_fbc=1, shouldn't this be all detected by the driver? It
should have turned it on if I am able to get PC7, I have seen PC7 before, but
there is inconsistent power usage.


Right now I do not have FBC turned on explicitly and the laptop is at PC6, but
upon waking up it will return to PC2 99% of time, it is unable to go lower when
disabling Hybrid/Switchable graphics, I can get to PC6 even at idle w/o display
being shut off.

So some inconsistencies in that just turning on the HSW iGPU kills power
performance when idle but not display disabled. I'm curious as to why...

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