[X2Go-User] Incomplete redrawing,of screen

[K. Reinhold Trier]

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?

Best regards
Reinhold
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