<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hello,</div>
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<div>I've been trying to enable PC8 on my Haswell i7-4600M Notebook but i'm not sure if it is working properly.</div>
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<div>During idle states (No X running) 915_pc8_status tells me that PC8 seems to be disabled:</div>
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<div>Requirements met: no<br/>
GPU idle: no<br/>
Disable count: 3<br/>
IRQs disabled: no<br/>
Enabled: no</div>
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<div>Is this supposed to be right?</div>
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<div>Powertop 2.5 reports that Package C-States never go above pc3 while Core C7-HSW and GPU RC6 states are always reached with > 90%.</div>
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Package | Core | CPU 0<br/>
| | C0 active 0.7%<br/>
| | POLL 0.0% 0.0 ms<br/>
| | C1E-HSW 0.9% 1.3 ms<br/>
C2 (pc2) 90.8% | |<br/>
C3 (pc3) 0.0% | C3 (cc3) 0.4% | C3-HSW 0.4% 0.4 ms<br/>
C6 (pc6) 0.0% | C6 (cc6) 0.0% | C6-HSW 0.0% 0.0 ms<br/>
C7 (pc7) 0.0% | C7 (cc7) 97.1% | C7s-HSW 97.5% 5.8 ms</div>
<div> | Core | CPU 1<br/>
| | C0 active 0.8%<br/>
| | POLL 0.0% 0.0 ms<br/>
| | C1E-HSW 0.0% 0.0 ms<br/>
| |<br/>
| C3 (cc3) 0.1% | C3-HSW 0.1% 0.3 ms<br/>
| C6 (cc6) 0.0% | C6-HSW 0.0% 0.0 ms<br/>
| C7 (cc7) 92.0% | C7s-HSW 92.3% 12.0 ms</div>
<div> | GPU |<br/>
| |<br/>
| Powered On 0.6% |<br/>
| RC6 99.4% |<br/>
| RC6p 0.0% |</div>
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Kernel is 3.13-rc4 from <a href="http://cgit.freedesktop.org/%7Edanvet/drm-intel/" title="~danvet/drm-intel">~danvet/drm-intel/</a><a href="http://cgit.freedesktop.org/%7Edanvet/drm-intel/log/?h=drm-intel-nightly">drm-intel-nightly.</a>
<div>Params are: i915.i915_enable_rc6=1 pcie_aspm=force i915.i915_disable_power_well=0 i915.enable_pc8=1 "acpi_osi=!Windows 2012" acpi_backlight=legacy</div>
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<div>dmesg goes here: http://pastebin.ca/2516591</div>
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<div>Any ideas?</div>
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