Hi everyone,
in the past I was able to compile QT with EGLFS on Raspbian Buster. I don't remember exactly how I did it, but it uses FKMS driver. Back then full KMS was not supported on Pi 4.
I read that these days, it should work, i.e. I am trying to do an up-to-date build on Rapsberry Pi Lite Trixie.
I heavily rely on Gemini assistance, but I always end up with a project that fails with:
According to Gemini the problem is that it EGLFS GBM is not detected:
...which might or might not be the case.
I have tried dozens of workarounds it suggested but obviously I'm running in circles here.
Any ideas?
Is it even true that I should be able to use full KMS these days on Pi 4 (and hopefully Pi 5 as well)?
Disclaimer: Of course, Gemini won't do a good job here, no need to comment on that. It was a last resort as I didn't know what to do and always failed anyway. But that's not the point of the question.
Thanks!
in the past I was able to compile QT with EGLFS on Raspbian Buster. I don't remember exactly how I did it, but it uses FKMS driver. Back then full KMS was not supported on Pi 4.
I read that these days, it should work, i.e. I am trying to do an up-to-date build on Rapsberry Pi Lite Trixie.
I heavily rely on Gemini assistance, but I always end up with a project that fails with:
Code:
qt.qpa.egldeviceintegration: Failed to load EGL device integration "eglfs_kms"Code:
QPA backends: DirectFB ............................... no EGLFS .................................. yes EGLFS details: EGLFS OpenWFD ........................ no EGLFS i.Mx6 .......................... no EGLFS i.Mx6 Wayland .................. no EGLFS RCAR ........................... no EGLFS EGLDevice ...................... yes EGLFS GBM ............................ no EGLFS VSP2 ........................... no EGLFS Mali ........................... no EGLFS Raspberry Pi ................... no EGLFS X11 ............................ no LinuxFB ................................ yes VNC .................................... yesI have tried dozens of workarounds it suggested but obviously I'm running in circles here.
Any ideas?
Is it even true that I should be able to use full KMS these days on Pi 4 (and hopefully Pi 5 as well)?
Disclaimer: Of course, Gemini won't do a good job here, no need to comment on that. It was a last resort as I didn't know what to do and always failed anyway. But that's not the point of the question.
Thanks!
Statistics: Posted by Aros — Fri Jan 02, 2026 12:43 pm — Replies 0 — Views 27