Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Wed, 1 Dec 2021 08:30:08 -0800

On 12/1/21 4:34 AM, Oscar Ibañez via Tech-talk wrote:
> Hi all,
> 
> I am trying to run CSS Phoebus inside a Docker container and using it via a VNC server. However, there is a problem with the Phoebus dropdown menus (File, Applications, Window and Help). The problem is that, when I click on the menu name to unfold it, the unfolded menu just appears for a few miliseconds, and then it disappears. If I hold the mouse button pressed, the menu is unfolded, but just until I release the mouse button, because it disappears again. If I press the mouse button and I move the cursor on the screen, the menu keeps on unfolded, but only of the cursor does not enter on the unfolded area. If that happens, the menu disappears.
> 
> I have used X11vnc and Tigervnc as VNC servers, and Vinagre and KRDC as VNC client. The OS is CentOS 7.
> 
> Any idea?

Sounds like: https://github.com/ControlSystemStudio/phoebus/issues/640

I've seen this with a few different remote X methods, but not in
others.  It appears to be bug(s) in an underlying library
(openjfx or gtk).  Variables which might change the behavior
include GL implementation and/or version, and X window manager.

For me, menus don't disappear right away.  So a workaround is to
click with the mouse, and then navigate with the arrow keys.

You might try switching from VNC to X2Go or XPRA, or to a distribution
with a newer Mesa library version.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System