Haswell high power usage [i5-4258U Macbook pro retina 11.1 13"]

Hi Arch 20% (50%->30%)
OS X 10% (50%->40%)
I have checked It is also pretty I have tried Socket [0] - TURBO ENABLED Max Frequency Max TURBO Real Current Core [core-id] Core 1 [0]: Core 2 [1]: powertop tells Package | | | | C2 (pc2) 53.2% | C3 (pc3) 3.1% C6 (pc6) 39.7% C7 (pc7) 0.0% C8 (pc8) 0.0% | C9 (pc9) 0.0% | C10 (pc10) 0.0% | | | | | | | | | | | Does anyone guys, I'm trying to figure out why Arch uses around twice the power of OS X when idle (and light usage). With the laptop idle, not going to sleep or turning the screen off, I measured the battery usage over 80 mins,
other smaller intervals such as 100% to 95% or 80% to 78% at various times and it always works out to be around 4 mins to drain 1% on Linux and 8 mins to drain 1% on OS X.
obvious during moderate usage, if I use Arch on the train on my way to and from work it drains around double the battery compared to OS X. I have checked that the battery percentage is being reported correctly and it is almost the same between the two operating systems. 30% in Arch via the acpi command corresponds to 31% under OS X and 48% to 50%.
using i7z, i7z-git and powertop to measure the power states and clocks of the cpu. i7z reports that it is sitting at 800 MHz idle and only shows the C1 state.
[physical cores=2, logical cores=4, max online cores ever=2]
on 2 Cores, Hyper Threading ON
without considering Turbo 2498.96 MHz (99.96 x [25])
Multiplier (if Enabled) with 1/2/3/4 Cores is 29x/29x/29x/29x
Frequency 799.86 MHz [99.96 x 8.00] (Max of below)
:Actual Freq (Mult.) C0% Halt(C1)% C3 % C6 % Temp VCore
799.86 (8.00x) 1 98.7 1 0 39 0.7793
799.27 (8.00x) 3.83 98.7 0 0 33 0.7856
me that the processor is reaching the C10 state,
Core | CPU 0 CPU 2
| C0 active 0.1% 0.2%
| POLL 0.0% 0.0 ms 0.0% 0.0 ms
| C1E-HSW 0.0% 0.0 ms 0.0% 0.0 ms
|
| C3 (cc3) 1.3% | C3-HSW 0.0% 0.0 ms 1.7% 2.0 ms
| C6 (cc6) 0.1% | C6-HSW 0.1% 0.1 ms 0.1% 0.6 ms
| C7 (cc7) 96.7% | C7s-HSW 0.0% 0.0 ms 1.5% 2.5 ms
| C8-HSW 13.9% 69.9 ms 0.6% 1.5 ms
| C9-HSW 2.4% 4.9 ms 9.5% 8.7 ms
| C10-HSW 82.8% 167.2 ms 85.9% 14.0 ms
Core | CPU 1 CPU 3
| C0 active 0.1% 0.1%
| POLL 0.0% 0.0 ms 0.0% 0.0 ms
| C1E-HSW 0.0% 0.0 ms 0.0% 0.0 ms
|
| C3 (cc3) 2.0% | C3-HSW 2.2% 2.5 ms 0.0% 0.0 ms
| C6 (cc6) 0.0% | C6-HSW 0.0% 0.0 ms 0.0% 0.0 ms
| C7 (cc7) 97.4% | C7s-HSW 0.0% 0.0 ms 0.0% 0.0 ms
| C8-HSW 0.0% 0.0 ms 0.6% 3.0 ms
| C9-HSW 28.7% 96.5 ms 2.0% 10.3 ms
| C10-HSW 68.9% 58.0 ms 97.0% 140.0 ms
GPU |
|
| Powered On 1.8% |
| RC6 98.2% |
| RC6p 0.0% |
| RC6pp 0.0% |
have any ideas why it is using so much more juice under Linux?

ok a bit of an update I've gone thru all of the steps in the wiki on power saving,
https://wiki.archlinux.org/index.php/Power_saving
it has made no real difference, now it takes just under 5 mins to drain 1%, still much worse than the 8 mins in OS X.

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Okay...I thought deeply about this issue.
Even looking into ways to maybe fixing this on the software side. But it occured to me that this is to deeply embedded into the system that it won't be possbile to come up with a sufficient third-party solution.taht
The problem is that there is no intermediate step inbetween "standard DPI" graphics and "HiDPI" (image-resources named "[email protected]").
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Factor "2" to display 1280x800 on the 13" model and 1440x900 on the 15" model in HiDPI.
Factor "1.777..." would be required to display 1440x900 on the 2560x1600 screen of the 13" model.
Factor "1.714..." would be required to display 1650x1080 on the 2880x1800 screen of the 15" model.
Factor "1.523..." would be required to display 1650x1080 on the 2560x1600 screen of the 13" model.
Factor "1.5" would be required to display 1920x1200 on the 2800x1800 screen of the 15" model.
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But in my opinion there is a strong need for a "MidDPI" ([email protected]) intermediate step for all the UI graphic elements that wis based on the scaling factor 1.5.
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1680x1050 @ 2x = 3360x2100 (the surplus of 1872000px = ~2MP can still be handled by the Iris Pro IGP)
1920x1200 @ 2x = 3840x2400 (the surplus of 4032000px = ~4MP can't be handled sufficiently by the Iris Pro IGP)
NEW 1920x1200 @ 1.5x = 2800x1800 (nu surplus, native screen resolution, no border needed!)
The big advantage is that all the graphics have already been remodeled for the HiDPI mode.
So scaling those "factor 2x" images down to "factor 1.5x" should be comparably easy!
Example:
Left: Traditional "standard DPI" icon of "all my files".
Right: "@2x.png" for the "HiDPI" modes.
Middle: "@1.5x.png" suggestions for the "MidDPI" mode; easily scaled down from the lovely HiDPI graphics.
With this simple introduction of the "MidDPI" modes a significant amount of processing power can be saved.
This not only improves battery life when driving those higher scaled resolutions, but also lets the user access those resources for what really matters: processing power for the primary job that the Mac needs to get done.
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Haswell high power usage [i5-4258U Macbook pro retina 11.1 13"]

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