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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW]: power usage rises a lot after resume from suspend to ram"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83914">83914</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[HSW]: power usage rises a lot after resume from suspend to ram
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arekm@maven.pl
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=106351" name="attach_106351" title="dmesg">attachment 106351</a> <a href="attachment.cgi?id=106351&action=edit" title="dmesg">[details]</a></span>
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:
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [SNB regression] Power consumption goes postal after resume"
href="show_bug.cgi?id=54089">Bug 54089</a> - [SNB regression] Power consumption goes postal after resume</pre>
</div>
</p>
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