On Thu, Dec 26, 2013 at 02:46:18PM -0800, Paulo Zanoni wrote: > As far as I could check, your PCI ID is 0416, so your machine is not > ULT. As far as I know, your machine supports only up to PC7 state. I > may be wrong. Still, I will provide some comments below: You are right, my machine is not ULT. I suppose PC8 only works on ULT CPUs, correct? > To get into Pacakge C8 and deeper states you need all screens to be > disabled. You mentioned X is not running, so what exactly did you do > to disable all the screens? Nohting I just logged in from the console with no X running. So all connected screens have to be disabled for the device to reach PC8 state? > This means: either one or more screens are enabled, or the power well > is enabled, or both. Yeah, power well was enabled by mistake. disabled it but no changes. >> GPU idle: no > Something is submitting work to the GPU. No idea what that could be. > Did you go to the "tunables" tab and switch everything to "good"? All > devices (not only graphics) need to be properly configured for the > machine to reach PC8+. Yeah everything is "good" and still the haswell system is draining 16-18 Watts with no X and no discrete graphics present. That's what puzzels me. Running the exact same Linux/Kernel Configon a Sandy Bridge i7-2620M the power drain is approx 7-8 Watts with power save turned for all tunables. For Haswell powertop shows nice idle states exept the PC states stay at pc2/pc3 and never reach pc7 while Sandy bridge reaches pc7 most of the time. >> Kernel is 3.13-rc4 from ~danvet/drm-intel/drm-intel-nightly >> 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 > Why are you using all these options for i915? We recommend to stick to > the defaults since they are the best bug-free setup. Well, the pcie_aspm=force switch reduces power drain approx 4-5 Watts and the other acpi options need to be there for the keyboard/backlight to word. I've already removed the i915 params without effect. Thanks and Regards Nic _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
