我最近将 Toshiba L645 笔记本电脑上的 32 位 14.04 LTS 迁移到了 64 位 16.04 LTS。我遇到了 Unity 面板上的电源指示灯问题。当我将电源从交流电更改为电池时，通常indicator-power需要几分钟才能更新状态。我知道系统/硬件运行正常，因为udevadm monitor -u更改时会立即输出：
UDEV [3276.620509] change /devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0003:00/power_supply/ACAD (power_supply)
UDEV [3277.010187] change /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/BAT1 (power_supply)
UDEV [3451.378534] change /devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0003:00/power_supply/ACAD (power_supply)
UDEV [3451.770260] change /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/BAT1 (power_supply)
我认为真正的问题是用于更新其信息的upower软件包。当我这样做时，我可以看到它在电源状态改变时没有更新。我当前的版本是。indicator-powerupower --monitor-detailupower (0.99.4-2ubuntu0.2)
更新：这个问题不是持续性的，即有时候indicator-power可以立即起作用，有时候则不行。
这是upower daemon在 拔下电源时的输出11:58:20.495（请注意，native-path最初显示为BAT1但很快变为ACAD在11:58:20.499即使计算机仍处于断开连接状态。整整两分钟后，native-path才在 得到更正12:00:21.292）：
[11:58:20.495] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 11:58:20 AM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: fully-charged
warning-level: none
energy: 4.46 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 65.355 W
voltage: 12.568 V
percentage: 100%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-charged-symbolic'
[11:58:20.499] device changed: /org/freedesktop/UPower/devices/line_power_ACAD
native-path: ACAD
power supply: yes
updated: Sat 18 Jun 2016 11:58:20 AM NPT (0 seconds ago)
has history: no
has statistics: no
line-power
warning-level: none
online: no
icon-name: 'ac-adapter-symbolic'
[11:58:20.499] device changed: /org/freedesktop/UPower/devices/line_power_ACAD
native-path: ACAD
power supply: yes
updated: Sat 18 Jun 2016 11:58:20 AM NPT (0 seconds ago)
has history: no
has statistics: no
line-power
warning-level: none
online: no
icon-name: 'ac-adapter-symbolic'
[12:00:21.292] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.296] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.298] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.300] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.302] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.303] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.305] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.307] device changed: /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
power supply: yes
updated: Sat 18 Jun 2016 12:00:21 PM NPT (0 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 4.401 Wh
energy-empty: 0 Wh
energy-full: 4.46 Wh
energy-full-design: 4.4 Wh
energy-rate: 1.754 W
voltage: 12.105 V
time to empty: 2.5 hours
percentage: 98%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-full-symbolic'
History (charge):
1466230521 98.000 discharging
History (rate):
1466230521 1.754 discharging
[12:00:21.309] daemon changed:
daemon-version: 0.99.4
on-battery: yes
lid-is-closed: no
lid-is-present: yes
critical-action: HybridSleep
但是，当恢复交流电时，变化是即时的。只有当从交流电切换到电池状态时才会发生这种延迟！