Possible fix for proper unloading modules (#699)

[ghost]

Original rmmod doesn't resolve module dependencies. That's why we can't unload nvidia module, because of nvidia_modeset or nvidia_uvm. I think, that modprobe -r will resolve that problem, because it tries to unload all unnecesary, dependent modules.

[arafey]

Unfortunately, in my case this was insufficient because driver nvidia was in use by nvidia_modeset and not the other way around. So modprobe -r nvidia would fail but modprobe -r nvidia_modeset would unload both modules successfully. I don't know why there is an inconsistency here, I'm probably missing something.

Assuming that the inconsistency is unavoidable, then this function should "hunt" for the correct module to unload by trying modprobe -r nvidia, checking the result, trying modprobe -r nvidia_modeset, checking the result, and so on.

EDIT: Just saw your newer code in #709. You should probably update the PR since that code is superior.

[ArchangeGabriel]

This is already the case in the develop branch (against which one you should work and push): 1ada79f, but it has huge issues in Ubuntu at least. I’m working on it. Closing this PR.