[kwlug-disc] Strange poweron problem

[L.D. Paniak]

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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