[Cialug] Need help automating log capture/reboot

Mon Oct 9 23:17:00 UTC 2017

I had a problem with flaky usb psus, When trying to power a Pi3 everything
would work fine until I turned the blue tooth. What was going on was the
voltage was dropping below about 4.8 volts for a brief instant, the pi
would shutdown all usb i/o but would continue run. The only way to fix it
was to cycle the power. I had 3 usb psu's that were marginal to begin with
and those were the ones that caused a large amount grief.
One way to test is to power the pi through the 5v pin  with a higher
amperage psu on the gpio.
If you really what to see what going on invest in a good usb power analyzer.

This is the one I found that works the best.

http://portpilot.net/

Sure it's pricey but hey, you get you pay for but it'll will save you a lot
of time and grief in the end.

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On Mon, Oct 9, 2017 at 5:22 PM, Justin Richeson <neomatrixjr at gmail.com>
wrote:

> Ok, sorry...logs are not of the /var/log variety apparently...I need to
> look at that further.
>
> On Mon, Oct 9, 2017 at 5:19 PM, Justin Richeson <neomatrixjr at gmail.com>
> wrote:
>
> > I just installed iwconfig/wireless-tools and it shows that power
> > management is off.  I don't believe logs are preserved/rotated unless I'm
> > missing something.  I'm running OSMC for the distrobution on the SD.
> >
> > On Mon, Oct 9, 2017 at 5:12 PM, David Champion <dchamp1337 at gmail.com>
> > wrote:
> >
> >> Check the power saving mode in the driver? They have some other pointers
> >> too in this thread.
> >>
> >> https://raspberrypi.stackexchange.com/questions/15142/wifi-
> >> drops-on-raspberry-pi
> >>
> >> -dc
> >>
> >>
> >> On Mon, Oct 9, 2017 at 4:51 PM, Adam Hill <adam at diginc.us> wrote:
> >>
> >> > > copy all logs to a backup/snapshot
> >> >
> >> > are the logs not preserved / rotated across reboots?
> >> >
> >> > On Mon, Oct 9, 2017 at 4:01 PM Justin Richeson <neomatrixjr at gmail.com
> >
> >> > wrote:
> >> >
> >> > > The power supply is supposed to be 5v @ 4A....but unfortunately I
> >> don't
> >> > > have a good way to test that for sure.  I need to build some
> >> > multi-adapter
> >> > > cables for my in-line power analyzer.  Barrel plugs are always a
> pain
> >> > > though since there's so many....
> >> > >
> >> > > On Mon, Oct 9, 2017 at 3:21 PM, Dave Hala <dave at 58ghz.net> wrote:
> >> > >
> >> > > > I've ran into this few times over last couple of years, where the
> >> USB
> >> > hub
> >> > > > does not have a large enough power supply when loaded up devices.
> >> > > >
> >> > > > :) Dave
> >> > > >
> >> > > > On Mon, Oct 9, 2017 at 3:17 PM, Justin Richeson <
> >> neomatrixjr at gmail.com
> >> > >
> >> > > > wrote:
> >> > > >
> >> > > > > So, I've got a bit of an odd power/hub setup, but it seems to
> work
> >> > fine
> >> > > > for
> >> > > > > everything else...
> >> > > > > I've got a powered hub...and the raspberry pi is plugged into
> that
> >> > hub
> >> > > > as a
> >> > > > > device and is being powered by the hub....on one of it's higher
> >> power
> >> > > > > "charge" ports.
> >> > > > > And then the hub is plugged in as a device of the pi so I can
> use
> >> the
> >> > > USB
> >> > > > > hub...as a hub.
> >> > > > > If memory serves then, into the hub I have my wifi stick, a USB
> >> > stick,
> >> > > a
> >> > > > > USB-->Serial adapter for an X10 firecracker, and the pi.  I'll
> >> put a
> >> > > USB
> >> > > > > power analyzer on it again when I get home, but if memory serves
> >> it's
> >> > > had
> >> > > > > no power issues...and the pi never shows the power fault icon
> with
> >> > this
> >> > > > > setup.
> >> > > > >
> >> > > > > This is the hub:
> >> > > > > http://a.co/aZsGba1
> >> > > > >
> >> > > > > *NOTE* I just noticed...looking at the hub's description, that
> the
> >> > > > "charge"
> >> > > > > ports on the hub are just that...CHARGE ports.  In no way is the
> >> > > > raspberry
> >> > > > > pi a device unto itself via the hub.  It's 7+2.  7 HUB ports + 2
> >> > Charge
> >> > > > > ports.
> >> > > > >
> >> > > > > On Mon, Oct 9, 2017 at 1:44 PM, L. V. Lammert <lvl at omnitec.net>
> >> > wrote:
> >> > > > >
> >> > > > > > On Mon, 9 Oct 2017, David Champion wrote:
> >> > > > > >
> >> > > > > > > My first guess with the WiFi adapter is it's a power issue.
> Is
> >> > the
> >> > > > usb
> >> > > > > > > hubpowered or passive?
> >> > > > > > >
> >> > > > > > Probably plugged in directly, .. some other suggestion:
> >> > > > > >
> >> > > > > >  * A simple ping script would allow taking action (and
> recording
> >> > to a
> >> > > > > >    separate log file) - suggest ifdn/ifup the USB interface
> as a
> >> > > first
> >> > > > > >    test.
> >> > > > > >
> >> > > > > >  * Swap the PS with a new 2A unit anyway. You can get them
> for a
> >> > few
> >> > > > > bucks
> >> > > > > >    from China, or there are a number of US sources.
> >> > > > > >
> >> > > > > >  * Check the temp of the case and be sure you have decent
> >> > ventilation
> >> > > > > >    around the unit - some cases might need a small fan for
> 24/7
> >> > > > > operation.
> >> > > > > >
> >> > > > > > Let us know what you find, ..
> >> > > > > >
> >> > > > > >         Lee
> >> > > > > > _______________________________________________
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> >> > > > > >
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> >> > > > >
> >> > > >
> >> > > >
> >> > > >
> >> > > > --
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