Short update: As support for "openSUSE Leap 15.2" will end in a few months, I decided to make a fresh install of openSUSE Leap 15.3. Under this version, installation of the 460.84 driver is not possible anymore (deactivation of the Nouveau driver has no effect). Although I guess that this can easily be fixed, I see no future is these workarounds. openSUSE releases kernel updates every few weeks which always require to repeat the whole installation procedure of the NVidia driver. This involves multiple reboots and is simply too cumbersome for regular use. @NVidia: Please try to get a Dell Precision 7510 and fix the original problem.