[Bug 83914] New: [HSW]: power usage rises a lot after resume from suspend to ram

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83914

          Priority: medium
            Bug ID: 83914
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW]: power usage rises a lot after resume from
                    suspend to ram
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: arekm at maven.pl
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: DRI CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 106351
  --> https://bugs.freedesktop.org/attachment.cgi?id=106351&action=edit
dmesg

On my Dell XPS 15 (9530 model, late 2013) that uses

vendor_id       : GenuineIntel
cpu family      : 6
model           : 60
model name      : Intel(R) Core(TM) i7-4702HQ CPU @ 2.20GHz
stepping        : 3
microcode       : 0x1a
cpu MHz         : 2899.960
cache size      : 6144 KB

there is a problem that after resume from ram the power usage rises a lot,
about 7-10W (from 26-30W to 36-40W).

It happens with minimal userspace, so I don't blame userspace. powertop
estimates that 17W is used by "CPU core" (I assume intel gpu hides under this,
too). "perf top" doesn't show any obvious suspects.

When the problem happens registers look like this:
--- power-ok    2014-09-15 22:30:20.615917605 +0200
+++ power-bad    2014-09-15 22:31:43.383356688 +0200
@@ -130,12 +130,12 @@
                  TRANS_VSYNC_A: 0x00000000 (1 start, 1 end)
             TRANS_VSYNCSHIFT_A: 0x00000000
                     TRANSACONF: 0x00000000 (disable, inactive, progressive)
-                  FDI_RXA_MISC: 0x0a200090 (FDI Delay 144)
+                  FDI_RXA_MISC: 0x00200080 (FDI Delay 128)
                FDI_RXA_TUSIZE1: 0x7e000000
                    FDI_RXA_IIR: 0x00000000
                    FDI_RXA_IMR: 0x00000fff
               BLC_PWM_CPU_CTL2: 0xe0000000 (enable 1, pipe EDP, blinking 0,
granularity 128)
-               BLC_PWM_CPU_CTL: 0x149906e9 (cycle 1769, freq 5273)
+               BLC_PWM_CPU_CTL: 0x00000cc7 (cycle 3271, freq 0)
              BLC_PWM2_CPU_CTL2: 0x60000000 (enable 0, pipe EDP, blinking 0,
granularity 128)
               BLC_PWM2_CPU_CTL: 0x00000000 (cycle 0, freq 0)
                   BLC_MISC_CTL: 0x00000000 (PWM1-PCH PWM2-CPU)
@@ -149,7 +149,7 @@
                 PCH_PP_DIVISOR: 0x00186906
                    PIXCLK_GATE: 0x00000000
                         SDEISR: 0x00800000 (port d:1, port c:0, port b:0,
crt:0)
-            RC6_RESIDENCY_TIME: 0x771f52d8
+            RC6_RESIDENCY_TIME: 0x02ee80e1
                  FENCE START 0: 0x02cc0001
                    FENCE END 0: 0x042b8063
                  FENCE START 1: 0x00000000


For me that happens under 3.17.0-rc5 and 3.14.18. Going to test other versions
soon.

Note that there was similar problem for SNB but not sure if these are related:
Bug 54089 - [SNB regression] Power consumption goes postal after resume

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