I had the same problem as Francisco reported. My Nvidia card is NVIDIA Corporation TU117GLM [Quadro T1000 Mobile]
kwin-x11: 4:5.21.5-2 nvidia-driver: 470.74-1 linux-image-amd64: 5.14.9-2 I tried to downgrade nvidia-driver, but had problems while installing the package from stable release, so I went to install LXDE instead, which seems to work fine with the latest nvidia-driver. /Albert
