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


`glxinfo -B` shows that llvmpipe is used as opengl renderer.

After a lot of trial and error, I found out that if I comment out
`dtoverlay=disable-vc4` in config.txt, then 3d acceleration is working and
opengl renderer is "V3D 4.2".

I suggest that opensuse tumbleweed does not add the disable-vc4 overlay for
raspberry pi 400 (and possibly pi 4) users.