acpi fails to detect reconnected ac adapter Acer c710 kubuntu 14.10

[David]

acpi fails to detect reconnected ac adapter Acer c710 running kubuntu 14.10. To reproduce: Start running on AC adapter - power is sourced from AC adapter. Disconnect AC adapter and then it runs on battery. Reconnect AC adapter and laptop continues running on battery until they battery runs out and system shuts down. Problem is that software fails to detect AC adapter after reconnection.

Command 'fwts ac_adapter' reports 4 fails (i..e. each of its four tests failed.)

After AC adapter is reconnected in above:

'acpi -i' reports:
Battery 0: Discharging, 20%, 00:49:33 remaining
Battery 0: design capacity 2500 mAh, last full capacity 2241 mAh = 89%

'upower -d' output includes:
/org/frfeedesktop/Upower/devices/line_power_AC
...
line-power online: no

Daemon:
...
  on-battery: yes

--
The only way to get AC Adapter to charge battery is to power the system down. At that point, the LED indicator shows the AC Adapter is then charging battery. The system can also then be immediately restarted and the connected AC adapter will supply power. After rebooting, while still on AC Adapter:

'acpi -i' reports:
Battery 0: Charging, 19%, 01:31:52 until charged
Battery 0: design capacity 2500 mAh, last full capacity 2241 mAh = 89%

'upower -d' output includes:
/org/frfeedesktop/Upower/devices/line_power_AC
...
line-power online: yes

/org/freedesktop/Upower/devices/battery_BATX
...
  battery
  ...
     state: charging

Daemon:
...
on-battery: no

running 'fwts ac_adapter'
(with AC adapter still connected from powerup) gives the following (my actions are in brackets):
==== Make sure laptop is still connected to the mains power . ====
Press <Enter> to continue
(I press enter)
==== Please unplug the laptop power. ====
(I unplug it. Charging light stays on until 20 second countdown ends. Then the charging light goes out,
there is a beep, the please reconnect line shown below is typed by the program, and it then goes right
to the command line prompt without reporting the test results.)
==== Please re-connect the laptop power. ====
command line prompt>

----

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1453691/+editstatus and add the package name in the text box next to the word Package.

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[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.