[kwlug-disc] Strange poweron problem

[CrankyOldBugger]

It is a powered (ie. it has a small transformer) USB port so I would
imagine that it would handle the keyboard's requirements.

Googling this issue doesn't do much, but I did find one site where they
suspected that the hub is bad, and you seem to suspect the same thing, so I
will test that theory tonight.



On Mon, 25 Jul 2016 at 11:39 L.D. Paniak <ldpaniak at fourpisolutions.com>
wrote:

> Sounds like a weak power supply/heavy draw on the USB port.
> Keyboards can sometimes be surprising power sinks.
> It would not surprise me if you took the USB3 hub out your
> problem would go away.
>
>
>
> On 07/25/2016 10:59 AM, CrankyOldBugger wrote:
>
> I have an older machine running Ubuntu 16.04.  I'm having a strange
> problem with booting it.
>
> The system is a Intel® Quad-Core Processor J1900 + Micro ATX Motherboard
> (one of those motherboard with CPU bundles from Canada Computers).
>
> If I try to power on from cold, the power switch does nothing.  No lights,
> no noise, nada.  But if I unplug the USB cable in the back, the power
> switch lights up and away we go.  The USB cable in question is the only USB
> device attached, and it goes to a USB 3 hub on the desk which currently has
> my keyboard and mouse plugged in.  (It doesn't matter if I unplug the cable
> from the back of the PC or the hub itself, the results are the same.)
>
> So my question is why would the presence of a USB device stop the system
> from powering up, and even more so, why would unplugging the cable cause
> the system to suddenly power on?
>
> Sometimes after I do manage to get power on and we go through the POST
> Ubuntu will get stuck, but a repeat of power off, power on, unplug USB
> cable seems to clear that up.  I don't think this is related to the power
> issue but I can't rule that out yet.
>
> While I can live with the frustration of unplugging cables when I'm
> sitting there, it makes rebooting from remote login a pain.  I have maybe a
> one in three chance of seeing the system come back from remove reboot.
>
> Any ideas?
>
>
>
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