[X2Go-User] Occassionally very slow display update

[Milan Knížek]

Hello,

I run x2go server 4.0.1.15 on Arch Linux x86_64
  xorg-server 1.15.1
  x2go-agent 3.5.0.24-1
  nxagent 3.5.0.24-1

and x2goclient V.4.0.2.0 (Qt - 4.8.5) on Windows 7 with internal X
server. (Installed without admin privileges and running in portable
mode.)

Anyway, the issue described below happens for many months now, thus it
is not related to those particular versions.

After connection to the server, the desktop session (KDE) works just
fine. However, once I start using apps (usually Firefox, Evolution,
Smartgit, digiKam, Dolphin, etc.), the screen behaves like there are
timeouts or short drops in connection.

The screen may freeze for several seconds completely, it does not react
on clicks, keyboard typing, though it still remembers the actions and
"replays" them once the desktop resurrects: e.g. the clock widget on
task bar quikly displays the seconds timer changes, like in an
accelerated movie, then it freezes again.

Other times, it just becomes horribly slow - slowly redrawing.

A temporary solution is to close the app window and start it again. It
usually helps better to disconnect (logout) and connect again.
Suspending and resuming the session from the client does not help at
all.

Note that these issues are not caused by a bad connection per se: I can
open another SSH connection from cygqin and transfer big files back and
forth w/o problems at full speed (cca 2 Mbps up/down). SSH typing
response is also quick, hence latency should not be an issue either.

Logs on the server (syslog, x2go log level debug, CLI output of the
applications) do not show anything interesting at all.

I assume it may be due to the often discussed issues with applications
being compiled against up-to-date X libs, while nxagent still uses the
old X server.

I have tried to use x2goclient on Ubuntu 12.04 (armhf) for some time and
it seems it runs stable, w/o the issues.

Is there anything I can do at all to improve the user experience? Or at
least to debug the issues?

regards,
Milan


-- 
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