[arm-allstar] Pi losing ethernet connection

[David McGough]

Tom,

To get an absolute timestamp (not relative to the last boot) use:

dmesg -T


73, David KB4FXC


On Sun, 25 Jul 2021, "Kevin Davis via ARM-allstar" wrote:

> Those are elapsed time since reboot time stamps not a voltage reading.  Using the -e option on dmesg should provide a human readable time of the under-voltage condition, but looks like you have a lot.  

> On Jul 25, 2021, at 5:47 PM, Tom Eaton via ARM-allstar <arm-allstar at hamvoip.org> wrote:
> 
> No it is not visible, but I can make it if need be.
> 
> +0.282072] Under-voltage detected! (0x00050005)
> [  +6.240005] Under-voltage detected! (0x00050005)
> [  +6.229994] Under-voltage detected! (0x00050005)
> [  +0.000006] Under-voltage detected! (0x00050005)
> [  +4.160558] Under-voltage detected! (0x00050005)
> [  +2.090174] Under-voltage detected! (0x00050005)
> [  +0.000006] Under-voltage detected! (0x00050005)
> [  +2.080010] Under-voltage detected! (0x00050005)
> [ +18.710287] Under-voltage detected! (0x00050005)
> [  +0.000006] Under-voltage detected! (0x00050005)
> [  +6.240100] Under-voltage detected! (0x00050005)
> [Jul25 20:23] Under-voltage detected! (0x00050005)
> [  +0.000007] Under-voltage detected! (0x00050005)
> [ +12.480183] Under-voltage detected! (0x00050005)
> [ +12.480181] Under-voltage detected! (0x00050005)
> [  +0.000007] Under-voltage detected! (0x00050005)
> [ +12.479898] Under-voltage detected! (0x00050005)
> [ +12.480173] Under-voltage detected! (0x00050005)
> [  +0.000006] Under-voltage detected! (0x00050005)
> [  +6.239973] Under-voltage detected! (0x00050005)
> [  +4.159977] Under-voltage detected! (0x00050005)
> 
> Not sure I understand undervoltage if it says 12.480 under-voltage on some
> lines but I will put new power supply on it, it is on a power strip that
> has 5 amp usb ports.
> 
> Thanks
> 
>> On Sun, Jul 25, 2021, 8:36 PM "Kevin Davis via ARM-allstar" <
>> arm-allstar at hamvoip.org> wrote:
>> 
>> Probably apropo of nothing, but I had a similar issue and it turned out to
>> be an under-voltage issue.   As soon as I put a higher amperage power
>> supply on the Pi, my woes went away.
>> 
>> Run the following command to see if you've had any under-voltage
>> conditions.
>> 
>> dmesg -e | grep 'voltage'
>> 
>> On Sun, Jul 25, 2021 at 5:22 PM "David McGough via ARM-allstar" <
>> arm-allstar at hamvoip.org> wrote:
>> 
>>> 
>>> Hi Tom,
>>> 
>>> What is causing the RPi to loose network connectivity??  Do you have it
>>> behind a firewall?  Are you establishing permanent out-bound connections
>>> from this RPi?
>>> 
>>> 73, David KB4FXC
>>> 
>>> 
>>>> On Sun, 25 Jul 2021, "Tom Eaton via ARM-allstar" wrote:
>>> 
>>>> Pi3b losing ethernet connection,  reboot and it will work again for
>>> couple
>>>> of minutes or hours, when ethernet is down audio is broken some of the
>>>> time, even  telemetry voice is broken/chopping.  Does this sound like
>> SD
>>>> card or pi hardware.
>>>> 
>>>> Thanks
>>>> Tom
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>>>> 
>>> 
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