710178 - "ASSERTION: Battery API: When charging and level at 1.0, remaining time should be 0. Please fix your backend!"

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, defect)

Description

[[e-mail]]

+++ This bug was initially created as a clone of Bug #707085 +++

Calling navigator.mozBattery triggers:

###!!! ASSERTION: Battery API: When charging and level at 1.0, remaining time should be 0. Please fix your backend!: 'Error', file dom/battery/BatteryManager.cpp, line 200

My Windows XP desktop has no battery.

Comment 1

[Mounir Lamouri (:mounir)]

Makoto, it seems that your code doesn't take into account situations were there is no battery. Can you check if there actually is a battery with the Windows API? In that case, you should file the structure with the default values like you do when there is no status.

I should have catch that in the review of the initial patch, I'm sorry :(

If you don't have time to work on that soon let me know, I will try to have a look.

Comment 2

[Makoto Kato [:m_kato]]

maybe, some environment always returns unknown (-1) for remain time.  We should check whether level is 1.0.

Comment 3

[Mounir Lamouri (:mounir)]

(In reply to Makoto Kato from comment #2)
> maybe, some environment always returns unknown (-1) for remain time.  We
> should check whether level is 1.0.

We could do that but I think the best solution would be to check if there is a battery in the device. On Linux, that information is easily available. Can't we get it on Windows?

Comment 4

[Makoto Kato [:m_kato]]

(In reply to Mounir Lamouri (:volkmar) (:mounir) from comment #3)
> (In reply to Makoto Kato from comment #2)
> > maybe, some environment always returns unknown (-1) for remain time.  We
> > should check whether level is 1.0.
> 
> We could do that but I think the best solution would be to check if there is
> a battery in the device. On Linux, that information is easily available.
> Can't we get it on Windows?

If no battery, we can check other member of SYSTEM_POWER_STATUS.  But it can return unknown, so we should check whether level is 1.0.   If API cannot return unknown, I think it is better.

Comment 5

[Makoto Kato [:m_kato]]

Attachment: fix

Comment 6

[Mounir Lamouri (:mounir)]

Comment on attachment 582233 [details] [diff] [review]
fix

Review of attachment 582233 [details] [diff] [review]:
-----------------------------------------------------------------

r=me with the change.

Thank you for the quick fix :)

::: hal/windows/WindowsBattery.cpp
@@ +224,5 @@
>    if (status.ACLineStatus != 0) {
> +    if (aBattryInfo->level() == 1.0) {
> +      // GetSystemPowerStatus API may returns -1 for BatteryFullLifeTime.
> +      // So, if battery is 100%, set 0 at force.
> +      aBatteryInfo->remainingTime() = 0;

Please use kDefaultRemainingTime instead of 0.

Comment 7

[Makoto Kato [:m_kato]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/5efce975a9e7

Comment 8

[Marco Bonardo [:mak]]

https://hg.mozilla.org/mozilla-central/rev/5efce975a9e7