Comment # 18 on bug 1190608 from Stefan Dirsch

(In reply to Michael Pujos from comment #17)
> @Leo
> 
> The bbswitch module is only loaded by the prime-select systemd service
> (which in turn call /usr/sbin/prime-select) if prime-select operates in
> Intel mode ('prime-select intel' or 'prime-select intel2'). That service
> (eventually loading the bbswitch module in the cases mentioned above) is
> called at the very end of the boot process, just before the Display Manager
> is spawned.
> 
> Old versions of the suse-prime package did not pull bbswitch (you had to use
> the suse-prime-bbswitch package for that) but the new version does as it
> combines both packages.
> 
> The use of bbswitch to disable a PCI device (the NVIDIA card) can be
> dangerous and not work everywhere. Though it works on my laptop with a
> Pascal NVIDIA GPU, on all kernels. The suse-prime package update made all
> users use bbswitch now (again, only in Intel mode) which is probably not a
> good idea.
> 
> I will create a bug report for the upstream project.

Thanks for taking care, Michael!

https://github.com/openSUSE/SUSEPrime/issues/70