Comment # 5 on bug 1218780 from Ivan Ivanov

(In reply to Robert Riemann from comment #0)
> I installed
> openSUSE-Tumbleweed-ARM-KDE-raspberrypi.aarch64-2023.11.30-Snapshot20240109.
> raw.xz on my Raspberry Pi 400 (4GB RAM).
> 
> Unfortunately, no 3D acceleration works. The file /boot/efi/config.txt
> contains the following section that is also considered for PI 400 series:
> 
>     [pi4]
>     dtoverlay=vc4-kms-v3d,cma-default
>     dtoverlay=disable-vc4
> 

Please reinstall raspberrypi-firmware-config package. 

Original RPi4 sections in the package is: 

---
[pi4]

armstub=armstub8-rpi4.bin
# Note that the 7" DSI panel isn't supported at the moment through VC4, users
# can still use it through efifb by adding 'dtoverlay=disable-vc4' in
# 'extraconfig.txt'.
dtoverlay=vc4-kms-v3d-pi4,cma-default
dtoverlay=disable-v3d