Hi Christopher,
This may be a side-effect of using KDE. To determine the UI scale the JavaFX
code consults the “scaling-factor” setting in the “org.gnome.desktop.interface”
schema. You can check this on the command line:
gsettings get org.gnome.desktop.interface scaling-factor
This should be 0 so JavaFX can compute the scale itself. If it’s greater than 0
that’s the value JavaFX will use for the UI scale.
It appears that a KDE install can set this value to 1. In my case I started
with the ARM version of Ubuntu server and then installed KDE (kubuntu-desktop)
and afterward the scaling-factor was 1. This doesn’t happen when installing the
standard GNOME desktop.
Martin
> On Feb 13, 2024, at 2:13 AM, Christopher Schnick <[email protected]> wrote:
>
> Hello,
>
> several users of our JavaFX applications have reported that the UI scale is
> too small when the physical and logical screen resolutions differ on Linux.
> For example in this case
>
> <Screenshot_20240125_115224(1).png>
>
> there is an implicit scaling factor of 150% included as the monitor is a 4k
> display but is using a lowered resolution of 2560x1440. This is then further
> stretched as the OS resolution is 1920x1080, but the main problem is that the
> 150% factor is somehow not getting picked up and JavaFX is treating this as a
> 4k display, thus making everything too small. For now these users can use
> -Dglass.gtk.uiScale=1.5 but that is not a nice solution to this problem.
>
> Best
> Christopher Schnick
>
