Bumblebee-Project/Bumblebee — comment on commit 98a3bb17be30855d5847ba75f0bda0a913cfd025
File:  line 0
By Lekensteyn:

Why did you disable this behavior? It'll cause upgrades from the MrMEEE code to fail because he used it for storing a version number (file). Previously (before merging opensuse-dev into develop), the line was:

rm -f /etc/bumblebee
This would keep directories, but remove the version file.