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It's not a problem of the of the Xserver. A (software) screenshot
shows a correct screen, this is what the Xserver "thinks" he would
display whereas the real screen is scrambled. But only in the case
of a x2go-connection, not in local operations. And - as described
before - only when using hardware of somehow low performance
together with HDMI connection. <br>
I found a posting describing a similar problem:
<a class="moz-txt-link-freetext" href="http://lists.x2go.org/pipermail/x2go-user/2016-February/003717.html">http://lists.x2go.org/pipermail/x2go-user/2016-February/003717.html</a><br>
<br>
Reinhold<br>
<br>
Am 02.10.2017 um 17:29 schrieb Ulrich Sibiller:<br>
<span style="white-space: pre-wrap; display: block; width: 98vw;">> On Mon, Oct 2, 2017 at 4:49 PM, K. Reinhold Trier
> <a class="moz-txt-link-rfc2396E" href="mailto:R.Trier@it-jobst.de"><R.Trier@it-jobst.de></a> wrote:
>> Hello,
>>
>> we are using x2go server and clients both on Ubuntu 16.04. After
>> configuring new clients on small single board boxes like a ZODAC
>> Zbox or a Raspberry Pi 3 we observe severe screen redrawing
>> problems an a very poor performance in video transfer. E.G.
>> shifting a Thunderbird-window over a Firefox-window the latter
>> remains scrambled with rests of Thunderbird. We didn't run into
>> that problem in our former installation based on Ubuntu 12.04.
>> After searching for solutions in the compression method and the
>> CPU-performance of the clients I occasionally found out that the
>> problem disappears after connecting the client's monitor via VGA
>> instead of a HDMI connection. The problem even disappears when a
>> HDI/VGA-Adapter is used and the signal is fed to the monitor via an
>> VGA-input. This was tested with different monitors. In our former
>> clients we only used VGA connected monitors and so we could not see
>> the problems. The optical quality of a HDMI connected Monitor is
>> notably better than that of VGA connected one, furthermore the VGA
>> connection seems to become obsolete, so we would like to stay with
>> HDMI. What can be the reason and is there a way change the
>> HDMI-output in to a suitable configuration?
>
> To me this sounds like a buggy Xserver on the client. There's really
> nothing in X2go (or better: in NX) that cares about the type of
> connection.
>
> Uli
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