Hello,
I had a similar problem. David mentions perhaps this thread:

https://mail.google.com/mail/u/0/?tab=wm#inbox/149198bbf7826f64

Bremenpl suggested to use the debian console version instead of the LXDE
version. It solved my problem.

We just encontered a 2 hours mains power outage this saterday.The BBB went
on running flawless with the battery backup.

Michel

2014-11-17 1:09 GMT+01:00 David Funk <[email protected]>:

> There is a previous thread, several weeks ago about this same behavior.
> That thread involved an application that ran off mains but had battery
> backup and everytime mains failed, and 5V goes away, the BBB shutdown.
>
> IIRC, this is a known software default behavior when the 5V goes away, it
> is programmable and needs to be set accordingly to how the end user whats
> it to behave.
>
>
> -david
> .
>
>
> On Sun, Nov 16, 2014 at 5:52 PM, William Hermans <[email protected]>
> wrote:
>
>> in /etc/inittab
>>
>>
>>
>>
>>
>> *# What to do when the power
>> fails/returns.pf::powerwait:/etc/init.d/powerfail
>> startpn::powerfailnow:/etc/init.d/powerfail
>> nowpo::powerokwait:/etc/init.d/powerfail stop*
>>
>> You need to do some google "research" and see if this is a potential
>> issue for you.
>>
>>
>> On Sun, Nov 16, 2014 at 4:49 PM, William Hermans <[email protected]>
>> wrote:
>>
>>> Yeah, I doubt its the ethernet jack being plugged in and used. I have a
>>> TEMPER USB thermometer plugged in and running, plus ethernet, and USB
>>> networking.
>>>
>>> There could be a service on these new images that monitors AC power, so
>>> that it issues a shutdown when this occurs. I know threre is at least "CTRL
>>> + ALT + DEL" key press combo "event" in /etc/inittab, but have not looked
>>> to see if there is anything else. There could also a a conditional systemd
>>> service potentially doing this.
>>>
>>
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