RasPi4 dev version

[Nachteule]

I have absolutely no idea what you did

Quote:Dec 05 11:21:06: MESA-LOADER: failed to open vc4 (search paths /usr/lib/arm-linux-gnueabihf/dri:$${ORIGIN}/dri:/usr/lib/dri)

Seems that the required MESA libs are not installed

Terminal

root@kmxbilr2 ~ # ll /usr/lib/arm-linux-gnueabihf/dri/*vc4*
-rw-r--r-- 26 root root 8574860 Sep 25 16:13 /usr/lib/arm-linux-gnueabihf/dri/vc4_dri.so
root@kmxbilr2 ~ # dpkg -S /usr/lib/arm-linux-gnueabihf/dri/vc4_dri.so
libgl1-mesa-dri:armhf: /usr/lib/arm-linux-gnueabihf/dri/vc4_dri.so
root@kmxbilr2 ~ #

Please install those packages again:

Terminal

root@kmxbilr2 ~ # dpkg -l | grep 19\.1\.7 | awk '{print $2}'
libegl-mesa0:armhf
libgbm1:armhf
libgl1-mesa-dri:armhf
libgl1-mesa-glx:armhf
libglapi-mesa:armhf
libglx-mesa0:armhf
root@kmxbilr2

And if this does not help, please post /boot/config.txt