Comment 4 for bug 1404509

This also affects 14.04 LTS, although to a slightly lesser degree. In 14.04 we have a patch which does the modprobing for the "cpu" subsystem; but reportedly this also affects drivers of other platforms, so let's just backport that more generic upstream fix to cover all cases.

This can potentially cause a lot more attempts to load nonexisting modules, and thus affect boot speed a bit. For 14.04 we have a builtin kmod which is really fast to fail, so the impact should be negligible. It might be measurable on 12.04 on some systems, but then again as we do ship backported kernels on 12.04 and officially support them we don't have much choice here.