HiDPI not scaling correctly

[WMRamadan]

• Linux-distro (kernel version): Pop OS 20.10 Kernel 5.11.0-7614-generic
• Desktop Environment (KDE/GNOME etc.): GNOME 3.38.3 (X11)
• Qt Version:
• KDiskMark Version: 2.2.0
• FIO Version: fio-3.16

Description:

KDiskMark display does not scale using 4K (3840x2160) at 150% scale

Steps To Reproduce:

Download deb package from releases github link

[JonMagon]

QT_AUTO_SCREEN_SCALE_FACTOR=1 kdiskmark

[WMRamadan]

QT_AUTO_SCREEN_SCALE_FACTOR=1 kdiskmark

Yes this works, but it should be auto-scaled at the start of the application from GUI launch. Or at least have the setting available from within the application to launch in auto-scaled mode.

[JonMagon]

There is no other way to make a qt application work properly on hidpi.

[WMRamadan]

There is no other way to make a qt application work properly on hidpi.

I believe Qt 6 supports this:
https://doc.qt.io/qt-6/highdpi.html

Also the QT_ENABLE_HIGHDPI_SCALING environment variable, introduced in Qt 5.14, enables automatic scaling based on the pixel density of the monitor. Replaces QT_AUTO_SCREEN_SCALE_FACTOR.
https://doc.qt.io/qt-5/highdpi.html