[Interest] Running Qt application on Linux without screen

[Tony Rietwyk]

Hi Tomasz,

I think in Windows, it simply is not possible for a service app to also 
run in desktop - they have separate desktops.  The usual solution is to 
move data and commands between the service and desktop app via some form 
of inter process communication - TCP, pipes, mailslots, etc.

Can you use the same techniques in your app?  You should be able to 
easily split it, depending on how much data the desktop needs?

Hope that helps, Tony


On 18/06/2018 9:26 PM, Tomasz Olszak wrote:
> Hello,
>
> Has anyone of you needed to handle following use case?
>
>
> 1. Linux
> 2. Full screen GUI app -  fast as much as possible so no X, considered 
> eglfs over drm and wayland
> 3. It starts as a service without screen
> 4. Screen can be connected at any time - app should be visible on screen
>
> 3 seems currently impossible with Qt 5.10 (is there a point updating 
> it to 5.11).
>
> What I tried so far:
> 1. Eglfs app works ok with screen connected
> 2. Eglfs crashes when no screen connected in egl qpa
> 3. Eglfs work ok when I add in eglfs configuration file 
> (QT_QPA_EGLFS_KMS_CONFIG) certain modeline string as mode. However 
> when screen is connected there is no QGuiApplication::screenAdded 
> signal so I can't show application on different screen.
> 4. on Qt Wayland app exits with "Running on a compositor with no 
> screens is not supported". It comes 
> from QWaylandIntegration::initialize() and compositor is weston
>
> Any ideas how to approach such case?
>
>
>
>
>
>
>
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