The X11 connection broke (error 4). Did the X11 server die?

[ignacio82]

My app crashes when I try to maximize the window. Is there a way of fixing that?

[mviereck]

Can you provide some information, please? In general it is no problem to maximize a window.

Ideally you store ~/.cache/x11docker/x11docker.log at www.pastebin.com.

[ignacio82]

Does this help? https://pastebin.com/YK4TNH1G

[mviereck]

Ok, now I can see some possible reasons for the issue we can check out.

You have closed source nvidia driver on host. That can be problematic with fallback option --hostdisplay. Also, you have nvidia-runtime on your system. You can try:

• x11docker --hostdisplay --clipboard rstudioxhost:verse (less security restrictions)
• x11docker --hostdisplay --gpu --runtime=nvidia rstudioxhost:verse (GPU support)
• Install nxagent and try x11docker --nxagent rstudioxhost:verse (stable software rendering)

[ignacio82]

They all crashed: https://pastebin.com/CMc5CAj7

[mviereck]

ok. The log file is for the start with --nxagent Some error messages:

qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 1 0)
WARNING: Application calling GLX 1.3 function "glXCreatePbuffer" when GLX 1.3 is not supported!  This is an application bug!
QSGContext::initialize: stencil buffer support missing, expect rendering errors
qt.qpa.xcb: QXcbConnection: XCB error: 1 (BadRequest), sequence: 163, resource id: 209, major code: 129 (Unknown), minor code: 47
Received signal 11 SEGV_MAPERR 000000000000

The application calls GLX 1.3 although nxagent does not seem to support it. The message says this is an application bug.

But I would expect that this one works:

x11docker --hostdisplay --gpu --runtime=nvidia rstudioxhost:verse

Can you show me the log after running this command?

[ignacio82]

https://pastebin.com/SjngHqpC

[mviereck]

That's odd. With --runtime=nvidia all drivers needed should be available in container. But instead, the application failes to load a software rendering driver (swrast) and does not even try to use the nvidia driver:

libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

Could you please install xserver-xephyr and try: x11docker --xephyr rstudioxhost:verse

[ignacio82]

That kind of works but I have a huge almost empty window and a tiny window with my application without the option to change it size:

[mviereck]

Great! Some first progress. What window manager do you have on your host system? x11docker tries to automatically find one and should run in in Xephyr. You can also install a window manager, e.g. xfwm4 and run:

 x11docker --xephyr --wm=xfwm4 rstudioxhost:verse

Though, x11docker should auto-detect xfwm4, you would not need to specify it.

Another check with nxagent: You can try

x11docker --nxagent --xcomposite rstudioxhost:verse

[ignacio82]

x11docker --nxagent --xcomposite rstudioxhost:verse did not work

This computer has cinnamon. I tried this:

$ x11docker --xephyr --wm=cinnamon rstudioxhost:verse

x11docker note: Did not find a host window manager. 
  Please pull image x11docker/openbox or provide one of: 
  amiwm blackbox cinnamon compiz ctwm enlightenment fluxbox flwm fvwm jwm kwin kwin_x11 lxsession mate-session mate-wm marco metacity notion olwm olvwm openbox ororobus pekwm sawfish twm wmaker w9wm xfwm4

x11docker note: Option --wm: Starting host window manager: cinnamon --sm-disable

[mviereck]

What happened after these messages?

If it somehow did not work correctly, please install e.g. window manager xfwm4 or marco and try with them.

[mviereck]

Closing due to inactivity.

Feel free to comment again, I am happy to reopen the ticket.