** Changed in: canonical-devices-system-image
    Milestone: 13 => backlog

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https://bugs.launchpad.net/bugs/1512211

Title:
  Charging from USB battery, phone stops charging, switches on screen,
  and discharges

Status in Canonical System Image:
  Confirmed
Status in Ubuntu UX:
  Fix Committed
Status in Unity System Compositor:
  New
Status in unity-system-compositor package in Ubuntu:
  Confirmed

Bug description:
  When I was travelling recently I found that if I plugged into a USB
  battery overnight to charge my phone, when I got up the next morning
  the phone didn't have any more power than when I started.

  Turns out the reason is: when the phone decides the battery is full,
  it stops drawing current.  The battery then decides that charging is
  over and automatically switches off.  The phone then decides that it's
  been unplugged and turns the screen on.  I had set the phone to not
  automatically switch the screen off, so it just left the screen on all
  night.  The next morning it was as if it had never charged.

  So I have the following suggestions:

  1) Just don't turn the screen on when the user unplugs the charger
  2) If the intention is to let the user know that the charger has been 
unplugged, pop up a message.  Just turning the screen on isn't very useful 
feedback.
  3) If you are turning the screen on automatically it "doesn't count" wrt the 
user's "automatically turn off screen after..." setting.  This should always be 
just a few seconds.
  4) If the user has configured the phone to not automatically switch off the 
screen, don't automatically turn it on either
  5) Give me a few more options for automatically switching off the screen - 1, 
2, 3, 4, 5 and 10 is a lot of resolution at the low end.  Where is 30mins and 
1hour?

  P.S. this has nothing to do with webbrowser-app but I still can't
  figure out how to search launchpad for Ubuntu touch packages.

  
  ===============UX comment===================
  I will try to address all the points raised in the bug description.

  1) is invalid, we should turn on the screen when the user unplugs
  the charger and possibly show a message reminding the user to unplug
  the charger from the wall socket (if any).

  I agree with 2), the system should show a system message as well. This is 
already specified as one of the usecases of the new notifications system UX 
(which hasn't been implemented yet). 
  
https://docs.google.com/document/d/1xDSZ_dnAMAlhgFnnyjJEibaITXjVLp1_pnj_tATNm9I 
(private link)

  I agree with 3) and this behaviour is already specified in the Screen 
blanking policy, that means it is on the plan to implement it (if it's not 
already)
  
https://docs.google.com/document/d/1RBoVknCLZ4GQ8E_iVftd3i_KmdxI5d6JrBt7i5EDZO0 
(private link)

  4) is taken care of by implementing 3)

  Point 5) is valid but requires a new bug which should also specify the 
usecases when those longer values would be needed, so that UX designers can 
better understand the needs and the reasons behind a UX suggestion :)
  Matthew, could you please file that bug? :)

  Point 6) (the one presented in comment #1) is valid but requires a new bug, 
mentioning the usecases, just like 5). I have to say I am not really into that 
feature, because the screen backlight of devices like the Meizu MX4 probably 
consumes more power than a USB port provides (which is usually 500mA). So it 
needs special care and convincing usecases :)
  Matthew, could you please file that bug, specifying some usecases when this 
feature would be really handy? :) I can't promise we will implement it, but we 
can discuss it ;)

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