wrong screen size (resolution) on raspberry with EGLFS with vc4-kms-v3d

themts

Hey guys,

I configured the kernel via /boot/cmdline.txt on my target-resolution (1024x600):
video=HDMI-A-1:1024x600M@60D

When I open the OSD-Menu of the screen it even shows me the correct resolution, but when I start my QT-Application QScreen tells me I have a resolution of 512x300 and my application is completely cropped.

Any idea what I can do to fix it?

Strange thing is that QScreen has exactly half of the real size...

Dehghannn

Hi themts,
you can use QT_QPA_EGLFS_HEIGHT , QT_QPA_EGLFS_WIDTH, QT_QPA_EGLFS_PHYSICAL_HEIGHT and QT_QPA_EGLFS_PHYSICAL_WIDTH environment variables to specify your displays variables. you could either export these manually or use the Project>Run>Environment section in the Qt Creator to set them.
for more information about these and more variables you can visit link below:
https://doc.qt.io/qt-6/embedded-linux.html

themts

This was my first guess, so I already have these three parameters in my first lines of main.cpp but it didn't fix the problem.

qputenv("QT_QPA_EGLFS_INTEGRATION", "eglfs_kms");
qputenv("QT_QPA_EGLFS_WIDTH", "1024");
qputenv("QT_QPA_EGLFS_HEIGHT", "600");

lowPerformer

It may have been a while, but I have the same problem with a waveshare display: Exact half the real size (1280x800 here) is reported in Qt.

Has a solution been found in the meantime?

Greetings
lowPerformer