<div dir="ltr">I do most of my testing of real hardware, and came across the VGA problem also, I've migrated to using the <span class="" id=":3s3.1" tabindex="-1">hdmi</span> input to my monitor, and dongles that translate to <span class="" id=":3s3.2" tabindex="-1">hdmi</span>. And I'm able to swap the monitor cable indiscriminately.</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 29, 2016 at 3:59 PM, Adam Holt <span dir="ltr"><<a href="mailto:holt@laptop.org" target="_blank">holt@laptop.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span class="">On Mon, Aug 29, 2016 at 5:50 PM, James Cameron <span dir="ltr"><<a href="mailto:quozl@laptop.org" target="_blank">quozl@laptop.org</a>></span> wrote:<br></span><div class="gmail_extra"><div class="gmail_quote"><span class=""><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Only tested one monitor? Try another; the EDID communication path<br>
over VGA could have problems, or the data in monitor Flash unusual.<br></blockquote><div> <br></div></span><div>I tried a different brand of LCD monitor, and the problem remains:<br><br>Fedora 22 NUC allows re-attaching of the VGA cable every time, whereas both CentOS NUC's are highly intermittent (the VGA cable fails to show any video upon re-attachment, the vast majority of the time).<br><br>In hindsight, the other LCD monitor (tested across all 3 NUC's) behaves very much the same way. Perhaps 10% of the time (or less) video re-appears, sometimes triggered by starting/leaving X Windows using Ctrl-Alt-F1 or Ctrl-Alt-F2 (or running "reboot" from ssh, on any machine that was running X Windows at the time, causing video to suddenly re-appear during the shutdown process) but regrettably on both CentOS 7 NUC's (NUC6i3SYH & D34010WYKH) I haven't found any repeatable pattern that permits video to be usefully restored (without a full reboot!)<br><br>PS Problem occurs independent of CentOS 7 NUC's that are running X Windows and those that are not. I mention X Windows only because leaving X / re-entering X seems to (sometimes) facilitate recovery of the video signal in certain not-quite-repeatable situations.<br></div><span class=""><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Also check age of monitor. Mix not old and new wineskins.<br></blockquote><div><br></div></span><div>The earlier test monitor's from the prior decade it's true, but this newer test from a much more recent vintage ;) <br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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James Cameron<br>
<a href="http://quozl.netrek.org/" rel="noreferrer" target="_blank">http://quozl.netrek.org/</a><br>
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