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Subject: Re: is my phone ON or is it OFF?
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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 (usual caveats: my understanding may be out of date, different vendors 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.