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From: =?UTF-8?Q?J=C3=B6rg_Lorenz?= <hugybear@gmx.net>
Newsgroups: comp.mobile.android
Subject: Re: is my phone ON or is it OFF?
Date: Thu, 2 May 2024 16:45:39 +0200
Organization: Camembert Normand au Lait Cru
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On 02.05.24 13:43, bad💽sector wrote:
> On 5/2/24 02:17, Carlos E.R. wrote:
>> On 2024-04-27 11:16, Theo wrote:
>>> Jörg Lorenz <hugybear@gmx.net> wrote:
>>>> On 25.04.24 15:55, Frank Slootweg wrote:
>>>>> Jeff Layman <Jeff@invalid.invalid> wrote:
>>>>> [...]
>>>>>
>>>>>> The charging circuitry is within the battery itself. It controls the
>>>>>> rate of charge and, in particular, monitors the temperature of the
>>>>>> cell(s). If it gets too high it will stop the charging. Note though,
>>>>>> that the connection from the phone's charger socket (lightning, 
>>>>>> USB, or
>>>>>> whatever) goes through some of the phone's circuitry, so the phone 
>>>>>> knows
>>>>>> the state of charge of its battery. That way its % charge can be
>>>>>> displayed on the phone's screen, and battery-usage apps can let you 
>>>>>> know
>>>>>> what's being used and how long the phone might last before 
>>>>>> recharging is
>>>>>> essential.
>>>>>
>>>>>    The fact that the phone is charging and how full its battery is, is
>>>>> also displayed/displayable when the phone is switched 'off'.
>>>>>
>>>>>    Ergo, the phone is never really off. It's either awake or sleeping
>>>>> during normal use or in cold standby when the user switched it 'off'.
>>>>
>>>> Bullshit!
>>>> The OS is not booted when the Android is turned off.
>>>
>>> AIUI it is, kind of.  When you plug in the charger with the phone off, 
>>> the
>>> phone starts.  The bootloader then launches the Android kernel with 
>>> the flag
>>> androidboot.mode=charger
>>>
>>> Instead of doing the full Android boot, that causes the kernel to 
>>> launch a
>>> charger UI application that shows your battery percentage on the 
>>> screen or
>>> an animation (which comes from files on your OS partition).  The 
>>> charger app
>>> doesn't allow you to otherwise interact with the phone and other services
>>> like the radios aren't running, but the SoC is booted and running 
>>> software.
>>> The SoC is also doing standard power management, ie the charging process
>>> here likely looks very similar to charging when the phone is turned on
>>> (because it is, in essence).
>>>
>>> The full OS services are not running, but the Android kernel and the 
>>> charger
>>> app is.
>>>
>>> Theo
>>> (usual caveats: my understanding may be out of date, different vendors 
>>> may
>>> do their own thing, etc)
>>
>>
>> Hum!  That's the best explanation I have seen so far. Thank you. It 
>> explains things.
> 
> 
> Like your compuer, it's sleeping with one ear (and maybe eye) open.

Are you trying to spread FUD again?


-- 
"Alea iacta est." (Julius Caesar)