I recently migrated to 64-bit 16.04 LTS from 32-bit 14.04 LTS on my Toshiba L645 laptop. I am facing an issue with power indicator on the unity panel. When I change the power source to battery from AC, the indicator-power usually takes about couple of minutes before updating the status. I know that the system/hardware is working fine as the udevadm monitor -u instantly outputs on change:
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)
I think the real problem is the upower package that indicator-power uses to update its info. When I do upower --monitor-detail I can see that it's not updating when the power state is changed. My current version is upower (0.99.4-2ubuntu0.2).
Update: This problem is not persistent, i.e. sometimes the indicator-power works instantly, sometimes it doesn't.
Here's the upower daemon output when unplugged at 11:58:20.495 (notice the native-path initially says BAT1 but quickly changes to ACAD at 11:58:20.499 even though the computer is still disconnected. The native-path is corrected only at 12:00:21.292, full two minutes later):
[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
However, when back in AC, the change is instant. This delay only occurs when changing the state from AC to Battery!
Best Answer