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如果在桌面上，UPower 套件會輸出什麼

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如果在桌面上，UPower 套件會輸出什麼

在 Ubuntu 12.04 上，如果我使用以下命令：

    upower -i /org/freedesktop/UPower/devices/battery_BAT0

它將輸出電池的所有統計數據。但是，如果我使用桌上型電腦（即沒有電池？），它會輸出什麼？

答案1

從工作站：

$ upower -i /org/freedesktop/UPower/devices/battery_BAT0

輸出：

failed to set path: cannot refresh: Cannot get device properties for
 /org/freedesktop/UPower/devices/battery_BAT0: Couldn't call GetAll() to 
 get properties for /org/freedesktop/UPower/devices/battery_BAT0: Method
 "GetAll" with signature "s" on interface "org.freedesktop.DBus.Properties"
 doesn't exist

硬體詳細資料-CPU

$ lscpu
Architecture:          i686
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                3
On-line CPU(s) list:   0-2
Thread(s) per core:    1
Core(s) per socket:    3
Socket(s):             1
Vendor ID:             AuthenticAMD
CPU family:            16
Model:                 5
Stepping:              2
CPU MHz:               800.000
BogoMIPS:              5787.62
Virtualization:        AMD-V
L1d cache:             64K
L1i cache:             64K
L2 cache:              512K

硬體詳細資訊 - 主機板

$ dmidecode -t baseboard
# dmidecode 2.11
SMBIOS 2.6 present.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
    Manufacturer: ASRock
    Product Name: M3A785GMH/128M
    Version:                       
    Serial Number:                       
    Asset Tag:                       
    Features:
        Board is a hosting board
        Board is replaceable
    Location In Chassis:                       
    Chassis Handle: 0x0003
    Type: Motherboard
    Contained Object Handles: 0

Handle 0x0019, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: To Be Filled By O.E.M.
    Type: Video
    Status: Enabled
    Type Instance: 0

Handle 0x001A, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: To Be Filled By O.E.M.
    Type: SCSI Controller
    Status: Disabled
    Type Instance: 0

答案2

即使桌上型電腦沒有電池自行供電，它也可能有其他裝置提供電源資訊。例如，Apple iPad、Logitech Unifying HID 和功率計不會向系統提供更多信息，但它們可以報告功率統計數據。

由於提供的路徑upower -i在桌面上不存在（沒有電池，因此沒有BAT0），因此顯然會失敗並出現錯誤。

upower -d這是桌面上的範例。它列出了帶有可充電電池的 Logitech K800 鍵盤：

Device: /org/freedesktop/UPower/devices/keyboard_0003o046DoC52Bx000A
  native-path:          /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.2/0003:046D:C52B.0009/0003:046D:C52B.000A
  vendor:               Logitech, Inc.
  model:                K800
  serial:               FB841B86
  power supply:         no
  updated:              Wed 12 Feb 2014 12:11:10 PM CET (5 seconds ago)
  has history:          yes
  has statistics:       no
  keyboard
    present:             yes
    rechargeable:        yes
    state:               discharging
    percentage:          55%
  History (charge):
    1392203470  55.000   discharging

Daemon:
  daemon-version:  0.9.23
  can-suspend:     no
  can-hibernate:   no
  on-battery:      no
  on-low-battery:  no
  lid-is-closed:   no
  lid-is-present:  no
  is-docked:       no

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