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In Ubuntu 13.10 on my Mac Mini 4,1 the Devices tab in powertop reports a bunch of PCI devices using 100% power:

             Usage     Device name
          0.3%        CPU use
        100.0%        PCI Device: NVIDIA Corporation Device 0d9b
        100.0%        PCI Device: NVIDIA Corporation Device 0d9b
        100.0%        PCI Device: NVIDIA Corporation MCP89 PCI Express Bridge
        100.0%        Radio device: wl
        100.0%        Radio device: wl
        100.0%        Radio device: btusb
        100.0%        PCI Device: NVIDIA Corporation MCP89 High Definition Audio
        100.0%        PCI Device: NVIDIA Corporation MCP89 SATA Controller (AHCI mode)
        100.0%        PCI Device: Texas Instruments XIO2213A/B/XIO2221 IEEE-1394b OHCI Controller
        100.0%        PCI Device: Broadcom Corporation BCM43224 802.11a/b/g/n
        100.0%        PCI Device: Broadcom Corporation NetXtreme BCM57765 Gigabit Ethernet PCIe
        100.0%        PCI Device: Broadcom Corporation BCM57765/57785 SDXC/MMC Card Reader
        100.0%        PCI Device: NVIDIA Corporation MCP89 [GeForce 320M]
        100.0%        PCI Device: NVIDIA Corporation Device 0d9a
        100.0%        PCI Device: Texas Instruments XIO2213A/B/XIO2221 PCI Express to PCI Bridge [

The system's running a lot hotter than it did in OS X, and I assume it's because of these devices. I'm running the Mac Mini without a display, so I don't really need the NVIDIA 320M or any of the Wi-Fi/Bluetooth/Audio devices using power.

Is there a way I can cut power to some of the devices in this list, since I don't use them?

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