[Bug 54089] [SNB regression] Power consumption goes postal after resume

[bugzilla-daemon at freedesktop.org]

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

--- Comment #75 from Arkadiusz Miskiewicz <arekm at maven.pl> ---
Is that possible that this issue came back? Using 3.16 and 3.17git kernels.
After resume from ram power usage grows about 10W.

powertop shows that "CPU core" power usage rises a lot (GPU is part of this
right?) but not sure if this can be trusted.

Idle states are
                    | Powered On  3,3%    |
                    | RC6        96,7%    |

so rc6 is being used mostly. Even after resume. 

Happens after every suspend & resume cycle. This is Dell XPS 15 9530.
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor
Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])

Example, before suspend was ~26W, now:

The battery reports a discharge rate of 39.1 W
System baseline power is estimated at 35.8 W

Power est.    Usage     Device name
  16.5 W     11,0%        CPU core
  6.98 W     60,0%        Display backlight
  5.75 W     11,0%        CPU misc
  2.24 W     49,9 pkts/s  Network interface: wlan0 (iwlwifi)
  2.01 W     78,2 ops/s   GPU misc
  1.61 W     11,0%        DRAM
  620 mW    100,0%        USB device: USB Receiver (Logitech)
  106 mW     78,2 ops/s   GPU core
    0 mW      0,1 pkts/s  nic:tap0
    0 mW    100,0%        Radio device: iwlwifi
    0 mW    100,0%        USB device: xHCI Host Controller


How I can track this more?

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