Comment # 13 on bug 1173248 from Stefan Dirsch

Ok. prime-select script tries to unload the nvidia kernel modules for intel
mode, which of course cannot work as long as you're sitting on an Xserver,
which still needs them. But I think this is more a non-issue, after reboot it
should no longer be active and bbswitch active instead (NVIDIA and bswitch
don't like each other) . By using suse-prime-bbswitch you apparently are trying
disable the NVIDIA GPU completely, which is the feature of using
suse-prime-bbswitch.