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I'm currently running Debian/Jessie on a MacBook Pro Retina 10,1 15" (early-2103). Everything is going well (ethernet, WiFi, retina, etc.) but I worry about its power consumption.

laptop-mode manages the automatic power management of all my devices, all the tunables of powertop are Good and my i7 is running in powersave mode. The dicrete Nvidia video card isn't even running (Bumblebee/bbswitch turns it off as I don't need it). All bluetooth, card reader and stuff are disabled.

However, powertop reports the following with no X11, keyboard and screen brightness set to 0 and all devices powered off:

The battery reports a discharge rate of 15.7 W
System baseline power is estimated at 15.0 W

Power est.  Usage   Device name
692 mW  0.3%    CPU core
484 mW  29.9%   Display backlight
299 mW  0.3%    CPU misc
264 mW  0.0 ops/s   GPU core
0 mW    32.9%   USB device: EHCI Host Controller
0 mW    22.9%   USB device: usb-device-8087-0024
0 mW    12.8%   USB device: usb-device-0424-2512
0 mW    2.7%    USB device: Apple Internal Keyboard / Trackpad (Apple Inc.)
0 mW    0.0%    Audio codec hwC0D0: Cirrus Logic
0 mW    0.0%    Display backlight
0 mW    0.0%    USB device: usb-device-8087-0024
0 mW    0.0%    USB device: xHCI Host Controller
0 mW    0.0%    USB device: xHCI Host Controller
0 mW    0.0%    USB device: EHCI Host Controller
0 mW    0.0%    USB device: BRCM20702 Hub (Apple Inc.)
0 mW    0.0%    USB device: usb-device-05ac-820a
0 mW    0.0%    USB device: usb-device-05ac-820b
0 mW    0.0%    USB device: Bluetooth USB Host Controller (Apple Inc.)
0 mW    0.0 ops/s   GPU misc
0 mW    0.0%    USB device: FaceTime HD Camera (Built-in) (Apple Inc.)
100.0%  PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1
100.0%  PCI Device: Intel Corporation 3rd Gen Core processor Graphics Controller
100.0%  PCI Device: Broadcom Corporation NetXtreme BCM57765 Memory Card Reader
100.0%  PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller
100.0%  PCI Device: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port
100.0%  PCI Device: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port
100.0%  PCI Device: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port
100.0%  PCI Device: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode]
100.0%  PCI Device: Intel Corporation HM77 Express Chipset LPC Controller
100.0%  PCI Device: NVIDIA Corporation GK107 HDMI Audio Controller
100.0%  PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1
100.0%  PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2
33.0%   PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1
0.0%    PCI Device: Broadcom Corporation Device 16a3
0.0%    PCI Device: Broadcom Corporation BCM4331 802.11a/b/g/n
0.0%    PCI Device: NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition]
0.0%    PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller
0.0%    PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2
0.0%    PCI Device: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller
0.0%    PCI Device: Intel Corporation 3rd Gen Core processor DRAM Controller

Manually doing the sum gives a ridiculously low value, but powertop stills report a 15W consumption.

However, running powertop in interactive mode in X11 gives me more plausible values:

The battery reports a discharge rate of 29.0 W
System baseline power is estimated at 16.4 W

Power est.    Usage     Device name
12.3 W    100.0%        Display backlight
8.01 W     29.9%        Display backlight
4.61 W     19.4%        CPU core
3.78 W    419.6 ops/s   GPU misc
3.12 W      4.3 pkts/s  Network interface: wlan0 (b43)
2.76 W     19.4%        CPU misc
1.35 W    419.6 ops/s   GPU core
188 mW    100.0%        USB device: Apple Internal Keyboard / Trackpad (Apple Inc.)

What? My retina display is consuming 20W? No way! (actually, with a 50% brightness it gives like 15W, which is huge). Also, sometimes the Apple Internal Keyboard is consuming 5 W.

It's not even a bug in powertop since my battery is indeed discarging very fast (like 2h30 when fully charged with only X11 running).

  • Do you guys have an idea of what my problem is? I saw on other sites that some MBPr users report 10 W power consumption, or even less
  • Why is there this huge difference between the "battery discharge rate report" and the "system baseline power"?
  • Is that normal that my Screen and Keyboard use that much power?

I'm running a 3.10-3-amd64 stock kernel.

share|improve this question
    
Do you get the same readings on OSX? –  terdon Oct 10 '13 at 21:16
    
AFAIK, powertop won't work on OSX but I may give it a try. According to native OSX sensors apps, the power consumption is less than 10W when idle. –  dig Oct 10 '13 at 21:30
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