[X2Go-User] strange display issue with SDL apps

[Hanno Foest]

Hi,

I was running sz81, a ZX81 emulator using SDL, remotely with an IRC
client and noticed, that while it worked nicely if started in a session
using an x2go Linux client, after disconnecting the session and
reconnecting using a Windows client, the application window came up
garbled with display artifacts.

What's more, if I disconnect and reconnect the session using a Linux
client, it somehow manages to blank my complete local display as soon as
the SDL application window gets focus. This confused the hell out of me,
and I first suspected a crash, until I figured out what was going on.
It's really an SDL issue, I verified by running parallax-4.tar.gz from
http://olofson.net/examples.html which displayed the same behaviour.

I would guess x2go has some kind of SDL passthrough mode which is
somewhat buggy and doesn't work with windows. Is that correct, or what
is the expected behaviour?

- Hanno