我目前在 MacBook Pro Retina 10,1 15"（2103 年初）上運行 Debian/Jessie。一切都很順利（乙太網路、WiFi、視網膜等），但我擔心它的功耗。
筆記型電腦模式管理我所有裝置的自動電源管理，powertop 的所有可調參數都是好的我的 i7 正在運行節能模式。獨立的 Nvidia 顯示卡甚至沒有運行（Bumblebee/bbswitch 將其關閉，因為我不需要它）。所有藍牙、讀卡機和其他東西都已停用。
但是，powertop 報告以下內容無 X11，鍵盤和螢幕亮度設定為 0，所有裝置均已關閉:
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
手動求和得出的值低得離譜，但 powertop 仍然報告消耗 15W。
然而，在 X11 中以互動模式運行 powertop 給了我更合理的值：
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.)
什麼？我的視網膜顯示器功耗 20W？決不！ （實際上，亮度為 50% 時，功率約為 15W，即巨大的）。此外，有時 Apple 內建鍵盤的功耗為 5 W。
這甚至不是 powertop 中的錯誤，因為我的電池確實放電得非常快（例如充滿電且僅運行 X11 時需要 2 小時 30 秒）。
- 你們知道我的問題是什麼嗎？我在其他網站上看到一些MBPr用戶報告功耗為10W，甚至更低
- 為什麼「電池放電率報告」和「系統基線功率」之間存在如此巨大的差異？
- 我的螢幕和鍵盤使用這麼多電量正常嗎？
我正在運行 3.10-3-amd64 庫存內核。