Different resolution values returned by qGuiApp->primaryScreen().size() on different Graphic Environments (XFCE vs GNOME)

poor_robert

Hello Qt Friends,

I'm working on GUI application and I've tested on different Graphic Environments. I have noticed that when I run it on XFCE my application gets wrong screen size from:
https://doc.qt.io/qt-5/qguiapplication.html#primaryScreen-prop

I have multiple Graphic Environments. I use Ubuntu 20
There is only 1 screen that has 1920 x 1080 resolution in settings. Also xrand command returns the same resolution.
In my code I use:

qGuiApp->primaryScreen().size()

On Gnome3 and Plasma it returns proper value i.e. 1920 x 1080.
However, on XCFE (and LXDE) this command returns: 960 x 540

What's also strange when I run Plasma and then switch to XFCE it works fine. But after reseting PC and opening XFCE it returns wrong values...

Do you have idea what is missing?

SGaist

Hi,

That rather looks like an XFCE issue. Did you check the settings of that desktop environment ?

poor_robert

@SGaist Hello :)
Yes, and the Screen resolution is set to 1920 x 1080. Also xrandr returns the same value...

SGaist

Is there some "magnifying" settings ?
The factor 2 you have is troubling.