[Server-devel] [XSCE] CentOS 7 quirk: VGA cable not re-attachable

[George Hunt]

I do most of my testing of real hardware, and came across the VGA problem
also,  I've migrated to using the hdmi input to my monitor, and dongles
that translate to hdmi.  And I'm able to swap the monitor cable
indiscriminately.

On Mon, Aug 29, 2016 at 3:59 PM, Adam Holt <holt at laptop.org> wrote:

> On Mon, Aug 29, 2016 at 5:50 PM, James Cameron <quozl at laptop.org> wrote:
>
>> Only tested one monitor?  Try another; the EDID communication path
>> over VGA could have problems, or the data in monitor Flash unusual.
>>
>
> I tried a different brand of LCD monitor, and the problem remains:
>
> 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).
>
> 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!)
>
> 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.
>
> Also check age of monitor.  Mix not old and new wineskins.
>>
>
> The earlier test monitor's from the prior decade it's true, but this newer
> test from a much more recent vintage ;)
>
> --
>> James Cameron
>> http://quozl.netrek.org/
>> _______________________________________________
>> Server-devel mailing list
>> Server-devel at lists.laptop.org
>> http://lists.laptop.org/listinfo/server-devel
>>
>> --
>> <http://lists.laptop.org/listinfo/server-devel>
>> <http://lists.laptop.org/listinfo/server-devel>
>> Unsung Heroes of OLPC, interviewed live @
>> <http://lists.laptop.org/listinfo/server-devel>http://unleashkids.org !
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.laptop.org/pipermail/server-devel/attachments/20160829/486748a9/attachment-0001.html>