CC on Linux - error QSocketNotifier

[Michael123]

Hello,

We are trying to run CC on Linux. We installed it from source on Ubuntu Server 20.04.3 with no errors. When we enter the command "CloudCompare -platform offscreen" we get the following error:

QSocketNotifier: Can only be used with threads started with QThread
This plugin does not support propagateSizeHints()

The packages libqt5svg5-dev, libqt5opengl5-dev, qt5-default qttools5-dev, qttools5-dev-tools, libqt5websockets5-devare are all installed and up to date.

Does anyone have a solution?

Best regards
Michael

[daniel]

Is it an error or just a warning?

Because another quite usual reason for CC not being able to start is the GPU driver (or the GPU itself, typically if it's an old intel chipset).

[Michael123]

It is more of an error, as Cloud Compare is not working or doing anything. Does CC necessarily need a GPU for its calculation (sorry if that's a dumb question)?
We are using a R1F95C NVIDIA Quadro RTX 4000 Graphics, if that helps for the solution.

[daniel]

Well, Qt (the framework we use) requires a recent GPU. But a quadro RTX 4000 should work fine (at least if the driver is ok and found by Qt).