[X2Go-User] strange display issue with SDL apps

[Ulrich Sibiller]

Hi,

I don't know anything about SDL so all I can do is some speculation.
Maybe SDL uses some X11 operations that are not handled correctly.

What version of x2goagent are you using on the server side (x2goagent -version)?

Uli

On Fri, Feb 10, 2023 at 10:56 PM Hanno Foest <hurga-x2go at tigress.com> wrote:
>
> 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
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