[kwlug-disc] Strange poweron problem

[CrankyOldBugger]

I does...

4 port version (the culprit in question):
https://www.amazon.ca/dp/B00L5ISCGA
7 port version (very similar, and also failing):
https://www.amazon.ca/dp/B011BG6BTK



On Thu, 29 Sep 2016 at 07:00 Dan Hergott <dhergott at uwaterloo.ca> wrote:

> Do you have the amazon link for the product you can share so we don't
> purchase the product as well?
>
>
> Dan
>
> On 16-09-23 05:38 PM, Jeff Smith wrote:
>
> Sorry I haven't responded to this in a while, but I think I found the
> culprit:  a USB 3 hub.  I purchased some USB hubs off of Amazon a few
> months ago, and I've noticed that all of them are showing signs of
> degradation already.  In the case of the one attached to this
> particular Ubuntu box, I swapped it right out and it the computer seems to
> be booting from the power-off state without any problems now.
>
>
> I can't tell you what brand these USB hubs are, as they are
> no-name generic, but they are the ones with power switches for each port,
> and the USB cables are inserted on the very top of the hub.  I've had
> failures with three of these now.  I thought the individual power switches
> were a nice feature, but the rest of the hub is crap.
>
>
> Cranky
>
>
>
>
> ------------------------------
> *From:* kwlug-disc <kwlug-disc-bounces at kwlug.org>
> <kwlug-disc-bounces at kwlug.org> on behalf of B.S. <bs27975.2 at gmail.com>
> <bs27975.2 at gmail.com>
> *Sent:* 25 July 2016 18:01
> *To:* KWLUG discussion
> *Subject:* Re: [kwlug-disc] Strange poweron problem
>
>
>
> 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.
> >
> ...
> > 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.
> >
>
> Anyone know if any recent updates have come down involving USB hardware,
> particularly around USB 3?
>
> ...
> > If I try to power on from cold, the power switch does nothing.  No
> lights,
> > no noise, nada.
>
> This feels more like a short than anything else. Or you don't have the
> bios set to power up at power on (i.e. after a power failure) - but that
> feels unlikely as it would always have worked this way, and you wouldn't
> have asked as it would be your normal.
>
> It doesn't feel like a cable short, as you reported the issue remains
> regardless of which end of the usb cable you leave connected.
>
> I assume the hub and computer are on different power outlets, and when
> you say power on from cold, the hub is powered on throughout and you're
> not talking about turning a power bar on/off into which both are plugged
> - power on is from the computer front panel power button itself.
>
> > ... 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.)
> >
>  > ...
> >
> > Any ideas?
>
> First question is ... has anything changed recently?
>
> I feel your pain and bafflement ... 3 computers here don't come up
> properly after last nights power failure.
>
> In any case, see if you can narrow down the culprit. Different behaviour
> if you?:
> - use a different USB port? USB 3.0 should bring nothing to this party
> for just a keyboard and mouse.
> - unplug the hub's power? (Nor should hub power matter, for this case.)
> - direct connect without the hub?
> - if it follows the hub, put both devices direct, with the hub
> connected, then walk back to where you were until the problem reappears.
>
> i.e. which component does the problem follow?
>
>
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>
>
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>
>
> --
> εїз *´¨)
>        ¸.•´¸.•*´¨)   ¸.•*¨)
>       (¸.•´     (¸.•`     Dan Hergott, RCDD, Computer Science Dept.
>                           University of Waterloo
>                           519:885-1211 x32454
>
>
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