<div dir="ltr">I does...<div><br></div><div>4 port version (the culprit in question): <span style="color:rgb(17,17,17);font-family:arial,sans-serif"><a href="https://www.amazon.ca/dp/B00L5ISCGA">https://www.amazon.ca/dp/B00L5ISCGA</a></span></div><div><span style="color:rgb(17,17,17);font-family:arial,sans-serif">7 port version (very similar, and also failing): </span><span style="color:rgb(17,17,17);font-family:arial,sans-serif"><a href="https://www.amazon.ca/dp/B011BG6BTK">https://www.amazon.ca/dp/B011BG6BTK</a></span></div><div><span style="color:rgb(17,17,17);font-family:arial,sans-serif"><br></span></div><div><span style="color:rgb(17,17,17);font-family:arial,sans-serif"><br></span></div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, 29 Sep 2016 at 07:00 Dan Hergott <<a href="mailto:dhergott@uwaterloo.ca">dhergott@uwaterloo.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>Do you have the amazon link for the product you can share so we
don't purchase the product as well?</p>
<p><br>
</p>
<p>Dan<br>
</p></div><div bgcolor="#FFFFFF" text="#000000">
<br>
<div>On 16-09-23 05:38 PM, Jeff Smith wrote:<br>
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<blockquote type="cite">
<div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
<p>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.</p>
<p><br>
</p>
<p>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.</p>
<p><br>
</p>
<p>Cranky</p>
<p><br>
</p>
<br>
<br>
<div style="color:rgb(0,0,0)">
<div>
<hr style="display:inline-block;width:98%">
<div dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> kwlug-disc
<a href="mailto:kwlug-disc-bounces@kwlug.org" target="_blank"><kwlug-disc-bounces@kwlug.org></a> on behalf of B.S.
<a href="mailto:bs27975.2@gmail.com" target="_blank"><bs27975.2@gmail.com></a><br>
<b>Sent:</b> 25 July 2016 18:01<br>
<b>To:</b> KWLUG discussion<br>
<b>Subject:</b> Re: [kwlug-disc] Strange poweron problem</font>
<div> </div>
</div>
</div>
<font size="2"><span style="font-size:10pt">
<div><br>
<br>
On 07/25/2016 10:59 AM, CrankyOldBugger wrote:<br>
> I have an older machine running Ubuntu 16.04. I'm
having a strange problem<br>
> with booting it.<br>
><br>
...<br>
> Sometimes after I do manage to get power on and we
go through the POST<br>
> Ubuntu will get stuck, but a repeat of power off,
power on, unplug USB<br>
> cable seems to clear that up. I don't think this
is related to the power<br>
> issue but I can't rule that out yet.<br>
><br>
<br>
Anyone know if any recent updates have come down
involving USB hardware, <br>
particularly around USB 3?<br>
<br>
...<br>
> If I try to power on from cold, the power switch
does nothing. No lights,<br>
> no noise, nada.<br>
<br>
This feels more like a short than anything else. Or you
don't have the <br>
bios set to power up at power on (i.e. after a power
failure) - but that <br>
feels unlikely as it would always have worked this way,
and you wouldn't <br>
have asked as it would be your normal.<br>
<br>
It doesn't feel like a cable short, as you reported the
issue remains <br>
regardless of which end of the usb cable you leave
connected.<br>
<br>
I assume the hub and computer are on different power
outlets, and when <br>
you say power on from cold, the hub is powered on
throughout and you're <br>
not talking about turning a power bar on/off into which
both are plugged <br>
- power on is from the computer front panel power button
itself.<br>
<br>
> ... But if I unplug the USB cable in the back, the
power<br>
> switch lights up and away we go. The USB cable in
question is the only USB<br>
> device attached, and it goes to a USB 3 hub on the
desk which currently has<br>
> my keyboard and mouse plugged in. (It doesn't
matter if I unplug the cable<br>
> from the back of the PC or the hub itself, the
results are the same.)<br>
><br>
> ...<br>
><br>
> Any ideas?<br>
<br>
First question is ... has anything changed recently?<br>
<br>
I feel your pain and bafflement ... 3 computers here
don't come up <br>
properly after last nights power failure.<br>
<br>
In any case, see if you can narrow down the culprit.
Different behaviour <br>
if you?:<br>
- use a different USB port? USB 3.0 should bring nothing
to this party <br>
for just a keyboard and mouse.<br>
- unplug the hub's power? (Nor should hub power matter,
for this case.)<br>
- direct connect without the hub?<br>
- if it follows the hub, put both devices direct, with
the hub <br>
connected, then walk back to where you were until the
problem reappears.<br>
<br>
i.e. which component does the problem follow?<br>
<br>
<br>
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</blockquote>
<br>
<br>
</div><div bgcolor="#FFFFFF" text="#000000"><pre cols="72">--
εїз *´¨)
¸.•´¸.•*´¨) ¸.•*¨)
(¸.•´ (¸.•` Dan Hergott, RCDD, Computer Science Dept.
University of Waterloo
519:885-1211 x32454
</pre>
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